WO2010073060A1

WO2010073060A1 - Method, system, user device, base station, program and storage medium for cooperative communication

Info

Publication number: WO2010073060A1
Application number: PCT/IB2008/003628
Authority: WO
Inventors: 梁永明
Original assignee: 夏普株式会社
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2010-07-01

Abstract

A method, system, user device, base station, program and storage medium for cooperative communication are provided. According to the cooperative communication method of the present invention, for the user device which entered into the cooperative communication mode within the service cell, the service base station exchanges the communication environment information with at least one cooperated base station, and performs the union resource dispatch according to the exchanged communication environment information, and the communication environment information at least includes the channel state characteristic information for reflecting the channel state characteristic, and the interfere information of the adjacent cells, and the service base station and cooperated base station exchange the dispatch information that the union resource is dispatched, and perform the transmission of the cooperated data according to the dispatch information. The present invention has the characteristics of simple, comprehensiveness, high-efficiency and facility for achieving.

Description

Description Cooperative communication method and system, user equipment, base station, program and storage medium

The present invention relates to the field of wireless technology transmission, and in particular to a cooperative communication method based on communication environment information and scheduling information for cooperation between multiple base stations and multiple users, a base station, a user equipment, a communication system, and a A program and a storage medium that implement the cooperative communication method. Background technique

Due to the rapid development of personal or mobile communications, which has greatly contributed to the miniaturization and diversification of personal or mobile communication devices, personal or mobile communication devices have required the ability to have services such as multimedia services, online games, music downloads, video on demand and mobile TV. , which greatly stimulates and enhances the demand for personal or mobile communication capabilities. Therefore, in order to meet the demand for providing users with greater peak rates, a wider system band, higher peak rates, and better edge service quality are important requirements for future personal or mobile communication systems.

The 3GPP (3rd Generation Partnership Project) organization is an international organization in the field of personal or mobile communications and plays an important role in the standardization of cellular communication technologies. The 3GPP organization began designing EUTRA (Evolved Universal Mobile Telecommunications System and Land-based Radio Access) and EUTRAN (Evolved Universal Mobile Telecommunications System Network and Land-based Radio Access Network) from the second half of 2004. The project is also known as LTE (Long Term Evolution) project. In April 2008, the 3GPP organization began to discuss the standardization of the fourth generation (4G) cellular communication system at the Shenzhen meeting in China. For this reason, the 3GPP organization defines LTE-Advanced (LTE-A) as the current 3GPP LTE 8.0 version. The future 4G version is an evolved version. Systems based on the LTE-A version are not only required to have backward compatibility with systems based on the LTE 8.0 version, but also require higher downlink data rates for the cell center and downlink data rates for the cell edge. Therefore, a concept called CoMP (Coordinated Multi-point Transmission/Reception) has received extensive attention and support. CoMP is considered a tool in the LTE-Advanced system to provide high speed data rates, improved cell edge throughput and/or system throughput. The core idea of coordinated multipoint transmission/reception is through multiple base stations (BS, Base Station) and between multiple user equipments (UE, User Equipment).

1

Confirmation The cooperation not only achieves the purpose of simultaneously increasing the data rate of the cell center and the data rate of the cell edge, but also achieves the purpose of greatly suppressing the co-channel interference widely existing between the wireless cells. In the latest standardized document 3GPP TR 36.814 of September 2008, the downlink CoMP proposes dynamic cooperation between multiple geographically dispersed points, and can adopt "cooperative scheduling/beamforming" and "joint processing/transmission". Two ways. In the cooperative scheduling/beamforming mode, data arriving at one user equipment is instantaneously transmitted by one transmitting point, and cooperative scheduling can be used to control interference generated between coordinated cells; in the joint processing/transmission mode, one arrives User equipment (UE) data is transmitted simultaneously by multiple transmission points, for example, by coherently or non-coherently improving the quality of the received signal and/or actively eliminating interference for other user equipments (UEs). The downlink CoMP should contain the possibility of cooperation of different cells. From the perspective of the radio interface, there is no difference between the radio stations belonging to the same base station or different base stations for the UE. If inter-base station cooperation is supported, information from different base stations should be marked.

Multiple Input Multiple Output (MIMO) technology is considered to be a major breakthrough in smart antenna technology in today's wireless communications field. As the primary means of increasing the system's transmission rate, MIMO can multiply the capacity and spectrum utilization of communication systems without increasing system bandwidth. Therefore, the idea that MIMO technology will be the key technology that must be adopted in the new generation of mobile communication systems has reached a consensus and has received extensive attention. In addition, OFDM technology (Orthogonal Frequency Division Multiplexing) has strong anti-fading capability and high frequency utilization, and is suitable for high-speed data transmission in multipath environments and fading environments. The MIMO-OFDM technology that combines MIMO technology with OFDM technology has become the core technology of next-generation mobile communications. Therefore, the downlink of the LTE-A system will undoubtedly adopt MIMO-OFDM technology.

The inventors of the present invention have found through the investigation and analysis of the prior art documents that there are four cooperative communication methods for multi-base stations and multi-user devices for cellular systems:

(1) Downlink cooperation method between base stations based on uplink channel characteristics and downlink signaling

According to the channel characteristics of the uplink report and the signaling of the downlink transmission, the method divides the cooperation between the base stations into three modes: one is a multi-base station cooperation mode based on no channel characteristics and no downlink signaling; It is based on the multi-base station cooperation mode with no channel characteristics and downlink signaling; the third is based on multi-base station cooperation mode with channel characteristics and downlink signaling. See the literature: 3GPP LTE Proposal R1 -082469, Ericsson, "LTE-Advanced Coorinated Multipoint Transmission/Reception", Warsaw, Poland, 3GPP TSG RANI #53bis meeting, Jun.30-.4, 2008o The inventors of the present invention believe that the downlink signaling in the method is a posteriori information and is a method of dividing the downlink cooperation between the base stations. The information is only needed, so the method of Ericsson in Sweden is not comprehensive and the complexity is relatively high.

(2) Base station downlink cooperation method based on channel characteristics (CSI, Channel State Information) and data sharing

According to whether the channel characteristics are shared and whether the data is shared, the method divides the cooperation between the base stations into nine ways, wherein the channel characteristics are completely non-shared, partially shared, fully shared, and the data is divided into completely unshared, partially shared, and completely. Sharing, these nine methods are a combination of channel characteristic sharing characteristics and data sharing characteristics. See the literature: 3GPP LTE Proposal Rl-082325, Samsung, "Intel-cell Interference Management and Network MEMO", Warsaw, Poland, 3GPP TSG RANI #53bis meeting, Jun. 30-Jul. 4, 2008. The inventor of the present invention believes that the method does not indicate what data is included in the shared data. Therefore, the method of the Samsung company in South Korea is not very clear, and the implementation value is not very high.

(3) Inter-base station cooperation method based on exchange information

According to whether to use the information exchange between the base stations, the method divides the cooperation between the base stations into three modes: one is a multi-base station cooperation mode in which no exchange information is used between the base stations; the other is a multi-base station cooperation mode in which exchange information is used between the base stations; The third is a multi-base station cooperation mode in which a mixture of exchange information and exchange information between base stations is not used between base stations. See the literature: 3GPP LTE Proposal R1-082501, Alcatel Shanghai Bell, Alcatel-Lucent, "Collaborative MIMO for LTE-A downlink", Warsaw, Poland, 3GPP TSG RANI #53bis meeting, Jun. 30-Jul.4, 2008. The inventors of the present invention believe that the method is not very clear and that the cooperation of multiple base stations cannot be implemented according to this method.

(4) Inter-base station cooperation method based on shared data

According to whether the data is shared between the base stations, the method divides the cooperation between the base stations into five modes: one is a multi-base station cooperation mode in which channel information (CSI) and user equipment data are shared between base stations; and the other is only sharing channels between base stations. Multi-base station cooperation mode of status information; third, multi-base station cooperation mode in which only user equipment data is shared between base stations; fourth, multi-base station sharing scheduling information and interference to signal plus Nosie Ratio (ISNR) between base stations Way of collaboration; the fifth is A multi-base station cooperation mode in which no information is shared between base stations. See the literature: 3GPP LTE Proposal R1 - 082942, LG Electronics, "Network MIMO in LTE-Advanced", Jeju, South Korea, 3 GPP TSG RAN1 #54th meeting, Aug. 18-22, 2008. The inventors of the present invention believe that the method for dividing the cooperative mode between base stations is not uniform. Therefore, the method is not comprehensive, and the cooperation of multiple base stations cannot be well implemented according to this method.

In view of the fact that the existing cooperative communication methods for LTE-A systems in the world are not comprehensive or complex, it is necessary to find a comprehensive, efficient and simple multi-base station cooperation and multiple base stations and multiple A cooperative communication method for cooperation between users and corresponding devices and systems for use in LTE, LTE-A systems, and future fourth generation or other communication systems.

Summary of the invention

As described above, 3GPP LTE-A has determined to support multi-base station cooperation technology and cooperation technology between multi-base station and multi-user equipment, considering the multi-base station proposed in the prior art (including the proposal in the background section above) Insufficient cooperation, multi-base station and multi-user cooperative communication method, the object of the present invention is to provide a cooperative communication method, a base station, a user equipment and a communication system for cooperation between multiple base stations and cooperation between multiple base stations and multiple users, Programs and storage media. By arranging communication environment information acquired by a base station among multiple base stations, and further exchanging scheduling information to perform arrangement, operation, and coordination of multi-base station and multi-user equipment to obtain good system performance, compared with the conventional method, the present invention proposes Methods and systems are simple, comprehensive, efficient, and easy to implement.

According to an aspect of the present invention, a cooperative communication method based on communication environment information and scheduling information is provided, including the following steps:

For the user equipment entering the cooperative mode in the serving cell, the serving base station and the at least one cooperative base station exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, where the communication environment information includes at least channel state characteristic information reflecting channel state characteristics and Adjacent cell interference information;

The serving base station and the cooperative base station exchange scheduling information after joint resource scheduling, and perform cooperative data transmission according to the scheduling information.

According to another aspect of the present invention, a base station for implementing cooperative communication is provided, which includes a transceiver unit, a communication environment information receiving and measuring unit, a switching unit, and a resource scheduling unit.

The transceiver unit receives and transmits data and signaling. Communication environment information receiving and measuring unit The data received by the transmitting unit measures and obtains communication environment information, and the communication environment information includes at least channel state characteristic information reflecting channel state characteristics and neighbor cell interference information. The switching unit exchanges communication environment information with the neighboring base stations. The resource scheduling unit performs joint resource scheduling on the user equipment entering the cooperative mode according to the exchanged communication environment information, and the transceiver unit performs cooperative data transmission with the neighboring base station according to the scheduling information after the joint resource scheduling.

According to another aspect of the present invention, a user equipment for implementing cooperative communication is provided, which includes a transceiving unit, a data processing unit, and a cooperation information acquiring unit.

The transceiver unit receives and transmits data and signaling. The data processing unit processes the received data. The collaboration information acquiring unit acquires the cooperation information from the processed data, where the cooperation information includes the scheduling information after the resource base station and the cooperative base station jointly perform resource scheduling, and the data processing unit further acquires information related to the communication environment information, and feeds back the service via the transceiver unit. At least one of the base station and the cooperative base station, the communication environment information includes at least channel state characteristic information reflecting the channel state characteristic and neighbor cell interference information.

According to another aspect of the present invention, a communication system for implementing cooperative communication is provided, the communication system including a serving base station, a cooperative base station, and a user equipment, wherein a configuration configuration of the serving base station and the cooperative base station is the same.

The serving base station includes a transceiver unit, a communication environment information receiving and measuring unit, a switching unit, and a resource scheduling unit. The transceiver unit receives data and signaling; the communication environment information receiving and measuring unit measures and obtains communication environment information according to the data received by the transceiver unit, and the communication environment information includes at least channel state characteristic information reflecting channel state characteristics and neighboring cell interference information. The switching unit exchanges communication environment information with the cooperative base station; the resource scheduling unit performs joint resource scheduling for the user equipment entering the cooperative mode according to the exchanged communication environment information; and the transceiver unit cooperates with the cooperative base station according to the scheduling information after the joint resource scheduling data transmission.

The user equipment includes a transceiver unit, a data processing unit, and a collaboration information acquisition unit. The transceiver unit receives the data and the signaling; the data processing unit processes the received data; the collaboration information acquiring unit acquires the cooperation information from the processed data, where the cooperation information includes the scheduling information after the serving base station and the coordinated base station are combined with the resource scheduling. And the data processing unit further acquires information related to the communication environment information, and feeds back to at least one of the serving base station and the cooperative base station via the transceiver unit, where the communication environment information includes at least channel state characteristic information that reflects channel state characteristics and neighbor cell interference. Information.

According to another aspect of the present invention, a communication system for implementing cooperative communication is provided, the communication system including a child node and a center service node and a center cooperation node, wherein

For the child node of the cell where the central serving node is located in the cooperative mode, the central service node and the at least one central cooperative node exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, and the communication environment information includes at least the channel state characteristic. Channel state characteristic information and neighbor cell interference information;

The central service node and the central cooperative node exchange scheduling information after resource scheduling, and perform cooperative data transmission according to the scheduling information.

A child node is the basic unit that constitutes a communication system. The child node may be various mobile or fixed communication terminals, and may be a medium or a carrier device by means of wireless communication such as radio waves, Bluetooth, infrared rays, or the like, or a wired communication method such as an optical fiber, a cable, or a power line as a medium or a carrier. The specific types of devices include user equipment, personal communication devices or in-vehicle communication devices, sensors of wireless sensor networks, detectors, and the like. The central node (the central service node and the central collaboration node) is the basic unit that constitutes the communication system for managing, monitoring, and controlling the child nodes. The central node can be a variety of mobile or fixed communication systems or devices, such as base stations, repeaters, central controllers for ad hoc networks, and the like. The central node and the child nodes are connected by a connection line, which is a medium or medium for connection, and may be a wireless medium or medium, or a wired medium or medium.

According to another aspect of the present invention, a program for cooperative communication is provided, such that a serving base station and a computer at at least one coordinated base station side perform steps: for a user equipment entering a cooperative mode in a serving cell, a serving base station and at least one cooperative base station Exchanging communication environment information, and performing joint resource scheduling according to the exchanged communication environment information, where the communication environment information includes at least channel state characteristic information reflecting channel state characteristics and neighbor cell interference information;

According to another aspect of the present invention, a program for cooperative communication is provided, such that a computer on a user equipment side performs steps: Receive and transmit data and signaling;

Processing the received data;

Obtaining cooperation information from the processed data, where the cooperation information includes scheduling information after the resource base station and the cooperative base station jointly perform resource scheduling, and

Acquiring information related to the communication environment information and feeding back to at least one of the serving base station and the cooperative base station, the communication environment information including at least channel state characteristic information reflecting the channel state characteristics and neighbor cell interference information. According to another aspect of the present invention, a storage medium is provided having a cooperative communication program based on communication environment information and scheduling information, such that a serving base station and at least one computer on a cooperative base station side perform steps:

According to still another aspect of the present invention, a storage medium is provided having a cooperative communication program based on communication environment information and scheduling information, such that a computer on a user equipment side performs steps:

Receive and transmit data and signaling;

Processing the received data;

Acquiring information related to the communication environment information and feeding back to at least one of the serving base station and the cooperative base station, the communication environment information including at least channel state characteristic information reflecting the channel state characteristics and neighbor cell interference information.

The cooperative communication method and communication system based on communication environment information and scheduling information according to the present invention have the characteristics of comprehensive application, reasonable design, simple and high efficiency. Moreover, the cooperative communication method and the communication system based on the communication environment information and the scheduling information proposed by the present invention may be correspondingly changed according to the actual situation, and may be the third generation (3G), the super third generation (S3G, LTE), the fourth generation. (4G) Cellular Mobile Communications and Digital TV, Wireless Local Area Network (WLAN), Ad Hoc (Censor Network) > Digital Home Network (e-Home), Home Base Station Network (Home eNodeB), Wireless Wide Area Network (WWAN) ) Network design, layout, installation, collaboration, and operational solutions of the system provide important theoretical basis and specific implementation methods.

DRAWINGS

The above features and advantages of the present invention will become more apparent from the following detailed description read in the <

Figure 1 shows a schematic diagram of a multi-base station cooperative network in accordance with the present invention;

2 is a block diagram showing an exemplary multi-base station cooperative network (equipped with a repeater) to which a cooperative communication method according to the present invention is applicable;

3 is a block diagram showing another exemplary multi-base station cooperative network (equipped with a remote radio device) to which the cooperative communication method according to the present invention is applicable;

Figure 4 shows the specific content of the cooperative communication criteria in accordance with the present invention;

5 is a diagram showing a classification manner of multi-base station cooperation based on cooperative communication criteria according to the present invention; FIG. 6 is a schematic diagram showing a specific cooperation mode of a multi-base station cooperation category based on the classification manner shown in FIG.

7 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a first embodiment of the present invention;

8 is a flowchart showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to the first embodiment of the present invention;

Figure 9 illustrates a manner of switching between a non-cooperative mode and a cooperative mode of a user equipment in accordance with the present invention;

FIG. 10 is a schematic diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a second embodiment of the present invention; FIG.

11 is a flowchart showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a second embodiment of the present invention;

12 is a schematic diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a third embodiment of the present invention;

FIG. 13 shows communication environment information and scheduling information based on a third embodiment of the present invention. Flow chart of a multi-base station cooperative communication method;

14 is a schematic diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a fourth embodiment of the present invention;

15 is a flowchart showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a fourth embodiment of the present invention;

16 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a fifth embodiment of the present invention;

17 is a flowchart showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a fifth embodiment of the present invention;

18 is a schematic diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a sixth embodiment of the present invention;

19 is a flowchart showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a sixth embodiment of the present invention;

20 is a schematic diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a seventh embodiment of the present invention;

21 is a flowchart showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a seventh embodiment of the present invention;

22 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to an eighth embodiment of the present invention;

Figure 23 is a flow chart showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to an eighth embodiment of the present invention;

24 is a block diagram showing a specific structure of a base station based on communication environment information and scheduling information according to a ninth embodiment of the present invention;

25 is a block diagram showing a specific configuration of a user equipment based on communication environment information and scheduling information according to a tenth embodiment of the present invention;

Figure 26 is a diagram showing the structure of a communication system based on communication environment information and scheduling information according to an eleventh embodiment of the present invention.

detailed description

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. For clarity and detail The idea and specific implementation steps of the present invention are described below, and a specific embodiment of a cellular communication system suitable for LTE-A is given below. It should be noted that the present invention is not limited to the applications described in the embodiments, and is also applicable to the LTE system and future fourth generation or other communication systems.

Figure 1 shows a schematic diagram of a multi-base station cooperative network in accordance with the present invention. The example cooperative network includes a serving base station (BS100), a cooperative base station (BS10 BS102, BS103, BS104, BS105, BS106), and a cell center user equipment (UE111) and a cell edge user equipment (UE110).

In the present invention, the configuration of the serving base station and the cooperative base station are the same, and are collectively referred to as a base station; the cell center user equipment and the cell edge user equipment are collectively referred to as user equipment.

It should be noted that the cell center user equipment involved in the present invention refers to a user equipment that is located in a cell and whose user requirements are satisfied (for example, good channel quality, high signal to interference and noise ratio, low frequency interference, etc.). The central user equipment may be located in the center of the cell or at the edge of the cell. In contrast, a cell edge user equipment refers to a user equipment that is located in a cell and cannot meet user requirements (for example, poor channel quality, low signal to interference and noise ratio, large co-channel interference, etc.), and the cell edge user equipment may be located. The center of the community may also be located at the edge of the community.

However, for simplicity of description, in the description herein, the user equipment located in the edge zone within the cell is assumed to be a cell edge user equipment, and the user equipment located in the central area within the cell is assumed to be a cell center user equipment.

A multi-base station network is actually a very complex system, and there are many unresolved problems. For example, the cooperation between base stations is multi-hop or single-hop, and how many cooperative base stations can exchange Backhaul information. The user equipment can accept cooperation from several base stations at most, whether the user equipment needs to feed back channel state information to the cooperative base station, and so on. At present, the standardization work of the LTE-A version has only just started, and no specific solution to the above problems has been given. The inventors of the present invention believe that a multi-base station cooperative network that is as simple as possible should be employed on the premise that the system requirements are met, and thus the cooperative communication method of the present invention adopts the following cooperative communication criteria:

First, each base station should perform background data exchange with as few cooperative base stations as possible. For example, LTE-A preferably stipulates that each central base station has only single hopping capability without multiple hopping (Multiple Hopping). Capability, that is, each base station can only perform background communication with a base station directly adjacent to the geographical location;

Second, each user equipment should accept as few coordinators as possible under the premise that the quality of service is guaranteed. For cooperation of base stations, for example, it is preferred that LTE-A stipulates that each user equipment accepts cooperation from at most 2-4 coordinated base stations adjacent to each other. Preferably, each user equipment is allowed to accept at most from adjacent locations. Collaboration of 2 collaborative base stations;

Third, the cell edge user equipment may adopt a multi-base station cooperation manner, and the cell center user equipment improves the central data throughput through the serving base station transmission scheme instead of adopting a multi-base station cooperation manner;

Fourth, the signaling mechanism is as simple as possible. For example, it is preferred that the user equipment in the cooperative mode only needs to feed back information to the serving base station, and the user equipment in the cooperative mode does not need to receive signaling from the cooperative base station.

According to at least one of the above-described cooperative communication criteria, the cooperative communication method according to the present invention mainly comprises:

For user equipment entering the cooperative mode (eg, cell edge user equipment UE 110), the serving base station BS 100 and the cooperative base station (one or more of BS10 BS102, BS103, BS104, BS105, BS106) exchange communication environment information and according to the exchanged communication The environmental information is subjected to joint resource scheduling, and the communication environment information includes at least channel state characteristic information (such as channel quality indication information (CQI), channel state information (CSI), etc.) that reflects channel state characteristics, and adjacent inter-cell interference (ICI) information. (eg overload indication (OI), high interference indication (ΗΠ), etc.);

The serving base station BS100 and the cooperative base station (one or more of the BSs 10K BS 102, BS 103, BS 104, BS 105, and BS 106) exchange the scheduling information after the joint resource scheduling, and cooperatively transmit the data according to the scheduling information.

According to the cooperative communication principle described above, the present invention separately proposes a downlink cooperative communication method and an uplink cooperative communication method, and provides an intra-cell cooperative communication method and an inter-cell cooperative communication method. Different methods or a combination thereof can be employed in different communication systems and environments.

In the downlink cooperative communication method, one or more of the serving base station BS100 and the cooperative base station (BS101, BS102, BS103, BS104, BS105, BS106) further exchange data that needs to be cooperatively transmitted (as shown in FIG. 1, downlink data), Therefore, the data is transmitted to the cell edge user equipment UE1 lOo. The joint resource scheduling includes uniformly allocating spectrum, power, and bit resources according to the communication environment information of each base station, and determining a data transmission mode to be used by each base station.

In the uplink cooperative communication method, the serving base station BS100 transmits scheduling information to the cell edge. User equipment UE110. After the cell edge user equipment UE 110 transmits data to the serving base station BS100 and the cooperative base station (one or more of BS101, BS102, BS103, BS104, BS105, BS106), the serving base station BS100 performs an exchange operation with the cooperative base station, and merges The data transmitted by the cell edge user equipment UE 110. Here, the joint resource scheduling includes uniformly allocating and scheduling uplink frequency band resources of a plurality of base stations utilized by the user equipment according to communication environment information of each base station.

The intra-cell cooperative communication method and the inter-cell cooperative communication method will be schematically explained with reference to Figs. 2 and 3.

The cooperative communication method according to the present invention may further include the step of: the serving base station BS100 determines whether the user equipment (e.g., user equipment UE 110) enters the cooperative mode based on the communication environment information.

The cooperative communication method according to the present invention may further include the steps of: the serving base station BS100 and the cooperative base station (one or more of BS101, BS102, BS103, BS104, BS105, BS106) measuring neighbor inter-cell interference information, and the user equipment ( For example, the user equipment UE 110) feeds back channel state characteristic information to at least one of the serving base station and the cooperative base station.

In the present invention, there are various ways in which a user equipment (e.g., user equipment UE 110) feeds back channel state characteristic information (e.g., CQI, CSI, etc.) to a serving base station and/or a cooperative base station. The following embodiments will be specifically described.

The switching operation between the serving base station and the cooperative base station can be through background information or directly to each other. For example, the inter-cell inter-frequency interference (ICI) information can be borrowed from the existing two methods of the LTE 8.0 version, broadcasting the ICI information method over the air interface or transmitting the ICI information through the X2 interface between the base stations; In a manner, for example, a large amount of data or a large amount of measurement information including channel state information is exchanged by way of background communication, and the medium for background communication may be an optical cable, a wired cable, or other wired or wireless medium.

2 is a block diagram showing an exemplary multi-base station cooperative network (equipped with a relay) to which the cooperative communication method according to the present invention is applicable. The multi-base station cooperation network includes a serving base station BS200, a cooperative base station (BS20K BS202, BS203, BS204, BS205, BS206), a cell edge user equipment UE210, and a repeater (RY200-1, RY200-2, RY200-3, RY200-4) , RY200-5 RY200-6, RY201- RY201-2 RY201-3, RY201-4, RY201-5, RY201-6, RY202- RY202-2, RY202-3. RY202-4, RY202-5, RY202-6 Wait). The repeater can be a simple physical layer (L0) replayer (Rep ter), physical layer (L1) The repeater can also be a link layer (L2) repeater or a network layer (high level, L3) repeater. The duplex mode of the repeater can be either frequency division duplex (FD) or time division duplex (TD).

In the example shown in FIG. 2, the user equipment UE 210 not only receives the data transmitted by the serving base station BS200 through the relay RY200-2, but also receives the cooperative base stations BS202 and BS203 through the repeaters RY202-4 and RY203-6, respectively. Downstream data transmitted (collaboratively transmitted data). The cooperative communication method shown in Fig. 2 employs an inter-cell cooperative communication method and a downlink cooperative communication method. '

Here, it should be noted that although the present invention only enumerates the repeater network shown in FIG. 2, the cooperative communication method and communication system based on communication environment information and scheduling information proposed by the present invention can be applied to any band. A cellular wireless communication network of a relay and any kind of wireless or wired communication system or communication network derived or derived therefrom.

Fig. 3 is a block diagram showing another exemplary multi-base station cooperative network (equipped with a remote radio equipment (RRE)) to which the cooperative communication method according to the present invention is applicable. The multi-base station cooperation network includes a central controller, a serving base station (BS300, BS301), and a cooperative base station

(BS302), user equipment (UE310, UE311), and remote radio equipment (RRE300-1, RRE300-2, RRE301-RRE301-2 RRE302-RRE302-2) _{o In} Figure 3, between the base station and the remote radio equipment through fiber optic cable or Connect other media such as cable.

In the example shown in FIG. 3, the edge data throughput of the user equipment UE 310 is improved by cooperative transmission of the remote radio equipments RRE300-1, RRE300-2 of the serving base station BS300 (intra-cell cooperative communication and downlink cooperative communication); The edge data throughput of the device UE311 is improved by the coordinated transmission of the four RREs of the remote radio equipment RRE301-1, RRE301-2 and the remote radio equipment R E302-1, RRE302-2 of the cooperative base station BS302 (inter-cell) Collaborative communication and downlink cooperative communication).

The central controller in Fig. 3 is used to exchange background information and/or scheduling information and/or control information of the base stations BS301, BS302.

Here, it should be noted that although the present invention only enumerates the RRE network shown in FIG. 3, the cooperative communication method and communication system based on communication environment information and scheduling information proposed by the present invention can be applied to any cellular with RRE. A wireless communication network and any kind of wireless or wired communication system or communication network that is derived or derived.

The multi-base station cooperative network structure shown in FIG. 2 and FIG. 3 is only an example of the cooperative communication of the present invention. The method can be specifically applied to a communication network, and the present invention is not limited to the cooperative communication method shown in Figs. 2 and 3. Further, the embodiments specifically enumerated hereinafter can be applied to the communication network structure shown in FIGS. 2 and 3 unless otherwise specified.

Figure 4 shows the specific content of the cooperative communication criteria in accordance with the present invention. On the basis of the cooperative communication criterion, the cooperative communication method of the present invention is mainly implemented by communication environment information and scheduling information, where the communication environment information includes communication environment information of the serving cell and communication environment information of the coordinated cell, and the scheduling information includes the serving cell. Scheduling information, scheduling information for non-serving (cooperative) cells, and other information.

The communication environment information of the serving cell and the coordinated cell includes feedback information and measurement information, and the feedback information includes at least channel state characteristic information (information reflecting channel state characteristics) fed back by the user equipment, for example, channel quality indicator information (CQI, Channel Quality Indicator). Or channel state information (CSI); and the measurement information includes neighboring inter-cell interference (ICI) information fed back by the user equipment, for example, an Overhead Indicator (OI, Overhead Indicator) or high reflecting the interference condition of the neighboring cell. Interference indication (HII, High Interference Indicator), etc. It should be understood that the base station also needs to perform corresponding detection or measurement to obtain feedback information.

The feedback information according to the present invention may further include a Signal to Interference plus Noise Ratio (SINR), a Precoding Matrix Indicator for the MIMO system, and a Rank for the MIMO system. At least one of an acknowledgment/non-acknowledgement (ACK/NACK), a scheduling request (SR, Scheduling Request), and the like for a hybrid retransmission request (HA Q). The channel state information CSI may be vector information including a channel phase, and the signal to interference and noise ratio may be long-term, medium-term or short-term information.

The communication environment information according to the present invention may further include measurements required at the base station side, such as Path-Loss, geographic location, Shadow Fading Information, motion speed of the user equipment, and received signal size indication ( RSSI, Receive Signal Strength Indication ) > Reference Signal Received Power (RSR, Reference Signal Received Quality), which reflects the peak-to-average ratio of the uplink quality (PAPR, Peak to Average Power Ratio) Or at least one of CM, Cubic Metric, DOA (Direction of Arrival), Quality of Service Parameter (QoS) reflecting the operation of the wireless cell, and the like. The scheduling information according to the present invention includes an identification number (ID) of the serving base station and the cooperative base station and respective system bandwidths, an identification number (ID) of the user equipment as a cooperative communication target, and the capability of the user equipment, carrier aggregation (Carrier Aggregation) Identification number (ID) of the component carrier, data transmission mode information of the serving base station and the cooperative base station (for example, MIMO mode, beam sequence number, PMI, etc.), configured frequency band of each wireless cell (Configured/Set S Frequency Band) At least one of a sub-band, a resource block/resource block group (RB/RBG, Resource Element Group), and a resource unit (RE, Resource Element).

Figure 5 illustrates a classification of multi-base station cooperation based on cooperative communication criteria in accordance with the present invention. The present invention classifies the cooperation status of communication environment information into three categories, namely, no shared communication environment information, partial shared communication environment information, and completely shared communication environment information. Moreover, the present invention classifies the cooperation status of scheduling information into three categories, namely, no shared scheduling information, partial shared scheduling information, and fully shared scheduling information. Thus, the multi-base station cooperation is divided into nine categories according to the sharing of the communication environment information and the sharing of the scheduling information, that is, the first to the ninth categories as shown in the figure.

Fig. 6 is a diagram showing a specific cooperation mode of a multi-base station cooperation type based on the classification scheme shown in Fig. 5. According to "Communication Scheduling / Beamforming" and "Joint Processing / Transmission", Figure 6 shows the relationship between communication environment information, scheduling information, and collaboration mode.

As shown in FIG. 6, in the case of completely sharing measurement information and partially sharing scheduling information, a cooperative mode of joint processing/transmission, cooperative scheduling, and cooperative dynamic beamforming (BF) is adopted.

The specific classification of the multi-base station cooperation and its corresponding cooperation mode can be flexibly set according to the actual communication environment and service requirements, and will be exemplified in the following specific embodiments.

[First Embodiment]

Fig. 7 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to the first embodiment of the present invention.

As shown in FIG. 7, the cooperative communication network according to the present embodiment includes a base station BS400 (serving base station), a base station BS401 (cooperative base station), a base station BS402 (cooperative base station), and a user equipment UE410. In this embodiment, the cooperative scheduling mode is adopted, that is, only one of the three base stations of the serving base station BS400, the cooperative base station BS401, and the BS402 instantaneously transmits data to the user equipment UE410 through the scheduling mechanism, and at the same time, improves the edge data throughput of the wireless cell. And the purpose of inhibiting ICI. As shown in FIG. 7, in this embodiment, only the serving base station BS400 enters the communication environment information of the user equipment UE410. Line reception and measurement, and the user equipment UE 410 also only feeds back information to the serving base station BS400. Figure 8 is a detailed description of the implementation steps of the first embodiment of the present invention.

Step S100, the serving base station BS400 receives and measures the communication environment information.

The communication environment information includes channel quality indication information (CQI) fed back by the user equipment UE410, and neighboring cell interference (ICI) information that reflects the neighboring cell interference situation of the coordinated base stations BS401, BS402. In this embodiment, channel quality indication information (CQI) may be obtained by detecting an uplink sounding reference signal (SRS, Sounding RS) at the serving base station BS400, and the CQI is obtained by the user equipment UE410 through a physical uplink control channel (PUCCH) or The Physical Uplink Shared Channel (PUSCH) is fed back to the serving base station BS400.

In this embodiment, the detection of the interference information of the neighboring cell uses the manner in which the base station of each radio cell continuously monitors the interference level (for example, thermal noise interference) on the entire frequency band, and if the interference exceeds a preset threshold, the uplink is passed. The channel transmits the overload indication information (01) to the neighboring other wireless cells in a broadcast mode (BCH).

Here, the feedback information of the user equipment UE 410 may also include a signal to interference and noise ratio, a precoding matrix indication for the MIMO system, a rank for the MO system, a response/non-response for the hybrid retransmission request, a scheduling request, and the like. at least one. The communication environment information may further include measurement information, such as path loss of the user equipment UE410, geographic location, shadow fading information, motion speed of the user equipment, received signal size indication, reference signal received power, reference signal reception quality, reflecting the uplink At least one of a peak-to-average ratio of quality, a fallback, an angle of arrival of the uplink, and the like, wherein, for example, the path loss can be obtained by detecting the reference signal received power at the serving base station BS400 side.

Step S101, the serving base station BS400 determines whether the user equipment UE 410 enters the cooperative mode. In this embodiment, the serving base station BS400 determines whether the user equipment UE410 enters the cooperation mode according to the communication environment information, and if the determination result is yes, the operation of step S102 is performed. If the determination result is negative, the non-cooperation mode operation is still performed, and the operation continues. Communication environment information is received and measured.

A decision method of whether the user equipment UE 410 enters the cooperative mode and the non-cooperative mode and how to switch between the cooperative mode and the non-cooperative mode are given below. Assume service base station

The BS 400 and the cooperative base stations BS 401 and BS 402 are in the same type of radio cell, and the decision of the user equipment to enter the cooperative mode is as shown in the formula (1).

Co _ Mode = /(α, β, χ, δ, ξ, η,...) ( 1 ) The threshold of the CQI is ", the threshold of the interference of the neighboring cell is, the bandwidth of the frequency resource is ^, the moving speed is, the long-term SINR is the quantized value of the quality of service (QoS), and the user equipment enters the cooperative mode. The formula C ₀ _M e is a multi-argument function. The event that triggers the user equipment to enter the cooperative mode from the non-cooperative mode includes: the CQI value of the user equipment is less than “, the threshold value of the adjacent cell interference is greater than, the frequency resource bandwidth and the interference gate The combination of one or more events in the product value of the limit value is greater than the set threshold value, the quantized value of the QoS is lower than the set threshold value, the long-term SINR value is less than the set threshold value, etc., triggering the user equipment from the cooperative mode The events entering the non-cooperative mode include: The CQI value of the user equipment is greater than ", the threshold value of the neighboring cell interference is less than P, the product value of the frequency resource bandwidth and the interference threshold is less than the set threshold, and the quantized value of the QoS. A combination of one or more events in the threshold value, the long-term SINR value ^ greater than the set threshold value, etc.. It should be noted that although this embodiment describes Service cell and cooperating cell is a cell of the same type, but the present invention can be equally applicable to the serving cell and cooperating cell to cell of different types of communication systems, cooperative communication principles and methods used are the same or similar.

In this embodiment, the serving base station determines whether the user equipment enters the cooperative mode according to the CQI of the serving cell and the 01 information in the serving cell. However, it is worth noting that the serving base station BS400 determines whether the user equipment UE 410 enters the cooperative mode. The serving base station may also determine, according to the CQI of the serving cell and the OI information in the serving cell and the coordinated cell, whether the user equipment enters the cooperative mode.

The manner of switching between the non-cooperative mode and the cooperative mode of the user equipment in accordance with the present invention will now be described with reference to FIG. The upper part of Fig. 9 shows the transmission mode and the Downlink Control Information (DCI) format of the existing LTE 8.0 version, and the lower part of Fig. 9 shows the transmission mode and the DCI format according to the present invention.

Assuming that the DCI of the existing LTE 8.0 version is N bits, the DCI (N+1 bits) according to the present invention is formed by adding 1 bit. The added 1 bit can be divided into a cooperative mode and a non-cooperative mode by a fixed manner, for example, '0' indicates a non-cooperative mode, and ' indicates a cooperative mode. By adding 1 bit, the N+1 bits of the DCI can also distinguish between the cooperative mode and the non-cooperative mode by shifting. For example, the non-cooperative mode is represented by a low bit such as 0000-0111, and is represented by a high bit such as 1000-1111. Collaboration mode.

If the user equipment enters the cooperative mode from the non-cooperative mode, the serving base station can pass the physical The row control channel (PDCCH) conveys physical layer (L1) control signaling, or transmits broadcast signaling through a broadcast channel (BCH), or transmits high layer (L3, network layer) signaling through a physical downlink shared channel (PDSCH); If the user equipment enters the non-cooperative mode from the cooperative mode, the serving base station may also transmit physical layer (L1) control signaling through a physical downlink control channel (PDCCH), or transmit broadcast signaling through a broadcast channel (BCH), or share through physical downlink. The channel (PDSCH) conveys high layer (L3) signaling. The two switching modes shown in FIG. 9 are a dynamic switching mechanism of downlink control information (DCI) through signaling of a physical downlink control channel (PDCCH) and signaling of a broadcast channel (BCH); or transmitting a high layer through a physical downlink shared channel. (RRC Layer 3, RRC, Radio Resource Control) signaling to implement a semi-static switching mechanism for Downlink Control Information (DCI). Among them, the dynamic switching mechanism adopts L1 signaling, which has the characteristics of good real-time performance, and the semi-static switching mechanism adopts L3 signaling, which has the characteristics of reliability and scalability.

As shown in the upper left part of Figure 9, the documentation of the 3GPP organization: TS 36.213 V8.3.0, "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Layer Procedures" (in the physical layer process of the evolved universal land-based radio access) Defines the transmission mode of 7 kinds of downlink data: Single antenna transmission (that is, using a single antenna to transmit signals, which is a special case of MIMO system, which can only transmit single layer data), and transmit diversity (that is, in MIMO system, use time) Or / and frequency diversity effect, transmit signal to improve signal reception quality, this mode can only transmit single layer data), open-loop space division multiplexing (ie, no space-division multiplexing of user equipment feedback channel state information is required) Closed-loop space-division multiplexing (that is, space-division multiplexing that requires user equipment to feed back channel state information), multi-user MIMO (ie, multiple users simultaneously participating in the downlink communication of the MIMO system), closed-loop single-layer precoding (ie, using MIMO) System, using precoding technology, only transmitting single layer data), beamforming transmission (ie using MIMO system, using beamforming Technology, only transfer single layer data).

The data transmission mode according to the present invention is shown in the lower left portion of Fig. 9 corresponding to the DCI format and the switching mode according to the present embodiment. Taking a fixed mode as an example, when '0' indicates a non-cooperative mode, the serving base station still adopts, for example, a transmit diversity mode, including cyclic delay diversity (CDD), space frequency block code (SFBC), space time block code (STBC), frequency. Switch the transmit diversity (FSTD) and so on. When the cooperation mode is indicated, the serving base station and the cooperative base station jointly use the transmission diversity, the open loop multiplexing, the closed loop multiplexing, the MU-MIMO, the closed loop single layer precoding, and the beamforming to cooperatively transmit data. Returning to FIG. 8, step S102, the serving base station BS400 and the cooperative base stations BS401, BS402 exchange communication environment information, and the communication environment information includes at least channel state characteristic information and neighbor cell interference information.

In the present embodiment, only the serving base station BS400 receives and measures the communication environment information of the user equipment UE410, and the user equipment UE410 only feeds back information to the serving base station BS400. Therefore, the serving base station BS400 and the cooperative base station BS401, The communication environment information exchanged by the BS 402 includes channel state characteristic information (CQI) of the user equipment UE 410 received by the serving base station BS400, and ICI overload indication information (01) transmitted between the serving base station BS400 and the cooperative base stations BS401, BS402.

The above communication environment information can be realized by background information exchange between the serving base station BS400 and the cooperative base stations BS401, BS402. In this embodiment, the LTE 8.0 version based on interference coordination combined with uplink power control is adopted, that is, the base stations of each wireless cell continuously monitor the interference level (for example, thermal noise interference) in the entire frequency band, if the interference exceeds the set The threshold transmits the overload indication information (OI) to the neighboring other radio cells in the broadcast mode (BCH) on the uplink, and the base station of the neighboring cell notifies the user equipment of the local cell to reduce the uplink transmission power by using the downlink signaling. Therefore, the ICI Overload Indication Information (OI) does not need to be exchanged through the background information, and if the base station has received the OI information of the neighboring cell, it does not need to be exchanged in step 102. Here, the manner in which the OI information is exchanged is also applicable to other embodiments of the present invention.

Step S103, the serving base station BS400 and the cooperative base stations BS401, BS402 perform joint resource scheduling.

The serving base station BS400 and the cooperative base stations BS401 and BS402 perform joint resource scheduling according to the communication environment information. The concept of joint scheduling includes unified consideration of respective communication environment information, unified allocation of spectrum, power, and bit resources, and determination of data transmission modes to be used by each. (See, for example, the lower left part of Figure 9), to reduce the amount of user equipment feedback and eliminate ICI interference, thereby achieving the goal of simultaneously improving cell center data throughput and cell edge data throughput.

According to the specific multi-base station cooperative network configuration structure, the concept of uniformly allocating spectrum resources includes uniformly allocating frequency band resources, uniformly allocating Fractional Frequency Reuse (FFR), and remote resource scheduling (RS, Remote Resource Scheduling). At this time, it is considered that the main purpose of communication between the cooperative base stations BS401 and BS402 is to improve data throughput at the cell edge in the BS 400. The amount and the ICI are reduced. Therefore, the data transmission mode of the serving base station BS400 and the data transmission mode of the cooperative base station should preferably have a certain relationship, such as a data multiplexing relationship, a diversity relationship, a multiplexing and diversity combination relationship, and a joint. Encoding relationships or other combination relationships. In this embodiment, the cooperative scheduling mode is adopted, that is, only one of the three base stations of the serving base station BS400, the cooperative base station BS401, and the BS402 instantaneously transmits data to the user equipment UE410 through the scheduling mechanism, and at the same time, the edge of the wireless cell is improved. The data throughput and the purpose of suppressing the ICI are. Therefore, the data transmission of the serving cell and the coordinated cell in this embodiment is not shared with each other, that is, the time division multiplexing relationship.

Step S104, the serving base station BS400 and the cooperative base stations BS401, BS402 exchange the information (scheduling information) after the joint resource scheduling and the data that needs to be jointly transmitted.

The information after joint resource scheduling includes the identification number (ID) of the serving base station BS400 and the cooperative base stations BS401, BS402, the data transmission mode of the serving base station BS400 and the cooperative base stations BS401, BS402, the system bandwidth of the serving base station BS400 and the cooperative base stations BS401, BS402, and The frequency band is used, wherein the data that needs to be jointly transmitted refers to the data that the serving base station BS400 sends to the cooperative base stations BS401 and BS402 through the background communication, which needs to be cooperatively transmitted. As described above, the coordinated data can be transmitted through the serving base station and the cooperative base station in a multiplexing manner, a diversity manner, a joint coding manner, and other combinations.

It should be noted that, according to the actual configuration of the communication system, the scheduled information may include an identification number (ID) of the serving base station and the cooperative base station, a system bandwidth, an identification number (ID) of the user equipment as a cooperative communication target, and a user equipment. The identification number (ID) of the unit carrier of the capability, carrier aggregation, the transmission mode information of the serving base station and the cooperative base station (eg, MIMO mode, beam number, PMI, etc.), the configured frequency band of each wireless cell, the subband, the resource block/ At least one of a resource block group, a resource unit, and the like.

Step S105, the serving base station BS400 and the cooperative base stations BS401, BS402 perform power allocation and transmitter optimization, respectively.

Preferably, on the one hand, the serving base station BS400 performs power allocation and transmitter optimization according to the information of the joint resource scheduling after the exchange; on the other hand, the cooperative base stations BS401 and BS402 perform power allocation according to the information of the exchanged joint resource scheduling. Transmitter optimization. The serving base station and the cooperative base station are also configured correspondingly according to the data transmission mode after the joint decision.

It is worth noting that power distribution and transmitter optimization based on scheduling information can be used in the prior art. Any suitable way during surgery. For example, the serving base station performs power allocation on the data to be transmitted, and adjusts the antenna angle, the number of antennas, or the transmission power of the transmitter.

Step S106, the serving base station BS400 sends signaling and data (downstream data stream 1 of the serving cell) to the user equipment UE410, and the cooperative base stations BS401, BS402 only transmit data (downstream data stream 2 and downlink data stream 3, respectively) to the user equipment. UE410.

In the present embodiment, since the cooperative base station transmits only the data to be cooperatively transmitted, the effect of reducing the complexity of the signaling mechanism can be achieved. In addition, as described above, this embodiment adopts a cooperative scheduling manner, that is, only one of the three base stations of the serving base station BS400, the cooperative base station BS401, and the BS402 instantaneously transmits data to the user equipment UE410 through the scheduling mechanism, actually It is a specific implementation manner of the 5th, 6th, 8th, or 9th cooperation method shown in FIG. 6, that is, the cooperative communication is realized by using part or all of the communication environment information and part or all of the shared scheduling information.

Step S107, the user equipment UE410 receives the data and signaling from the serving base station BS400 and the data transmitted by the cooperative base stations BS401, BS402.

After the user equipment UE410 receives the signaling and data sent by the serving base station BS400 and the data sent by the cooperative base station, it detects the transmission data of the serving base station BS400 and the transmission data of the cooperative base stations BS401 and BS402 by using the joint detection algorithm, and performs data on the data. Merger and further processing.

Step S108, the user equipment UE410 feeds back information (for example, current CQI, etc.) to the serving base station. It is noted that in the present embodiment, in order to clearly explain the present invention, the implementation process is described in the above-described sequential steps, but the present invention is not limited to the above. Sequence steps. For example, user equipment UE 410 may periodically or periodically provide feedback information. In this embodiment, the serving base station determines whether to enter the cooperative mode according to whether the communication requirement of the user equipment is met, but may directly determine whether to enter the cooperation mode or the like according to the request of the user equipment.

In this embodiment, only the case where the target user equipment is the UE 410 is schematically illustrated. It should be understood that in the case where the cooperative base station BS 401 further includes the cell edge user equipment UE411 (not shown), the exchanged communication environment information and the coordinated transmission The data should increase and change accordingly.

In addition, the cooperative communication method of the present embodiment is applicable not only to the multi-base station cooperative network shown in FIG. 2 and FIG. 3 but also to other various types of communication systems. [Second embodiment]

FIG. 10 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a second embodiment of the present invention. As shown in Fig. 10, the cooperative communication network according to the present embodiment includes a base station BS500 (serving base station), base stations BS501, BS502 (cooperating base station), and a user equipment UE 510. In this embodiment, a cooperative beamforming method is adopted, that is, only one of the three base stations of the serving base station BS500, the cooperative base stations BS501, and BS502 instantaneously transmits data to the user equipment UE510 by using a coordination mechanism between the beams, and simultaneously transmits data to the user equipment UE510. The purpose of improving wireless cell edge data throughput and suppressing ICI is achieved. Figure 11 is a detailed description of the implementation steps of the second embodiment of the present invention.

The implementation steps shown in Fig. 11 are substantially the same as those shown in Fig. 8, and are equally applicable to various variations and variations in the first embodiment, such as an OI exchange mode, a type of communication environment information, and the like. In order to avoid narration, the same content is not repeated, but the main points are different.

Step S200, the serving base station BS500 and the cooperative base stations BS501, BS502 receive and measure the communication environment information.

In this embodiment, the serving base station BS500 and the cooperative base stations BS501 and BS502 respectively transmit a Common Reference Sequence (CRS) to user equipments in respective cells. As shown in FIG. 10, the user equipment can receive not only the CRS of the serving cell BS 500 but also the cells of the cooperative base station BS 501 and BS 502 (that is, the cell where the BS 501 and the BS 502 are located) due to the edge location of the radio cell of the serving base station BS 500. CRS. Therefore, after calculating the CQIs of the serving base station BS500, the cooperative base stations BS501, and BS502, respectively, the user equipment UE510 feeds back three CQI values to the serving base station BS500 and the cooperative base stations BS501 and BS502, respectively. The ICI overload indication information (OI) between the serving base station BS500 and the cooperative base stations BS501 and BS502 is transmitted by each base station.

Here, the CQI definition of the downlink of the serving base station BS500, the cooperative base station BS501, the BS502 to the user equipment UE510 is a CRS-based definition method, but since the present embodiment is a multi-base station transmission method using cooperative beamforming, the CQI is The definition may also be based on a beam-based definition method, that is, the user equipment UE 510 uses the beam at this time to perform CQI calculation when a certain base station instantaneously transmits data to it. The method of defining the beam-based CQI has the advantage that the coordinated beam has the characteristics of good directivity and high intensity, and the calculation accuracy of the CQI is relatively high, and the disadvantage is due to the same Only one base station sends a beam to the user equipment at a time. The calculation period of the CQI is unstable, and the CQI information cannot be fed back to the base station periodically by the user equipment.

Step S201: The serving base station BS500 determines, according to the communication environment information, whether the user equipment UE 510 enters the cooperation mode.

The serving base station BS500 determines whether the user equipment UE 510 enters the cooperative mode according to the CQI value fed back by the user equipment UE 510 in the serving cell and the OI value reflecting the ICI condition.

If the result of the determination is YES, the operation of step S202 is performed. If the result of the determination is negative, the operation of the non-cooperative mode is still performed, and the communication environment information is continuously received and measured.

Step S202, the serving base station BS500 exchanges communication environment information with the cooperative base stations BS501, BS502.

The serving base station BS500 cooperative base station BS501, BS502 exchanges the CQI value of the cell edge user equipment UE510. In this embodiment, the CQI information is exchanged by using the CRS measurement method, and the OI value is directly transmitted between the serving base station and the cooperative base station, and there is no need to exchange again, but it should be understood that if other neighboring cells are used, ICI is used. The parameters of the situation need to be exchanged with CQI.

According to a variant of the embodiment, the user equipment UE 510 can simultaneously feed back three CQI values to the serving base station BS500, which are then exchanged by the serving base station BS500 and the cooperative base stations BS501, BS502.

Step S203, the serving base station BS500 and the cooperative base stations BS501, BS502 perform joint resource scheduling.

The concept of joint scheduling includes unified consideration of the respective communication environment information, unified allocation of spectrum, power, and bit resources, and determines the data transmission mode that each will use.

As shown in FIG. 10, the result of the joint resource scheduling is: At a certain moment, only the serving base station BS500 transmits data to the user equipment UE 510 using the beam labeled Beam-5 with the least interference from the neighboring cell; Only the cooperative base station BS501 transmits data to the user equipment UE 510 using the beam labeled Beam-3 with the least interference from the neighboring cell; at another time, only the BS 502 uses the beam labeled Beam-1 with the least interference from the neighboring cell. Data is transmitted to the user equipment UE 510. In this embodiment, in order to support cooperative beamforming between the serving base station BS500, the cooperative base stations BS501, and BS502, each base station is required to use dedicated reference information (DRS, dedicated Reference sequence ).

Since the embodiment is a cooperative beamforming mode, the purpose of the joint resource scheduling by the serving base station BS500 and the cooperative base stations BS501 and BS502 is firstly to eliminate or reduce ICI, and to improve the edge effect of the user equipment on the basis of overcoming the influence of ICI. the goal of. In other words, after the ICI interference of the user equipment is reduced, the channel state characteristics of the user equipment become correspondingly better, and the SINR value or the CQI value becomes correspondingly higher, and the edge data throughput of the user equipment can be improved. At the same time, when the SINR value or CQI value falls below the threshold of the non-cooperative mode, the user equipment can enter the cooperative mode and adopt a higher-order transmission mode to further improve the data throughput.

Step S204, the serving base station BS500 and the cooperative base stations BS501, BS502 exchange the information after the joint resource scheduling and the data that needs to be jointly transmitted.

The serving base station BS500 and the cooperative base station BS50 BS502 exchange the information after the joint resource scheduling and the data that needs to be cooperatively transmitted. The information after the joint resource scheduling includes the identification number (ID) of the serving base station BS500 and the cooperative base stations BS501, BS502 and the respective system bandwidth, the data transmission mode of the serving base station BS500 and the cooperative base stations BS501, BS502, the number of the beam, and the used frequency band. The data that needs to be jointly transmitted refers to the data that the serving base station BS500 sends to the cooperative base station BS50 BS502 through the background communication, and the coordinated data may be multiplexed, diversity, combined, and other combinations. .

Step S205, the serving base station BS500 and the cooperative base stations BS501, BS502 perform power allocation and transmitter optimization, respectively.

In this embodiment, the cooperative beamforming method is adopted, that is, only one of the three base stations of the serving base station BS500, the cooperative base station BS501, and the BS502 transmits data to the user equipment UE510 instantaneously through the beam cooperation mechanism, and at the same time, the edge of the wireless cell is improved. Data throughput and the purpose of suppressing ICI. Therefore, the data transmission in this embodiment is not shared with each other and is a time division multiplexing relationship.

Step S206, the serving base station BS500 and the cooperative base stations BS501, BS502 send signaling and data to the user equipment UE 510 according to the data transmission mode determined by the joint resource scheduling.

The cooperative base station in this embodiment also sends signaling to the target user equipment UE 510, which can further achieve a timely and good effect.

Step S207, the user equipment UE510 receives the signaling and data sent by the serving base station BS500. Similarly, the user equipment UE 510 also receives data and signaling transmitted by the cooperative base stations BS501, BS502. Step S208, the user equipment UE510 feeds back information to the serving base station BS500 and the cooperative base station.

[Third embodiment]

Fig. 12 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a third embodiment of the present invention. As shown in Fig. 12, the cooperative communication network according to the present embodiment includes a base station BS600 (serving base station), base stations BS601, BS602 (cooperating base station), and a user equipment UE 610. Fig. 13 is a detailed description of the steps of implementing the cooperative communication method according to the third embodiment.

The embodiment shown in Fig. 13 is substantially the same as the step shown in Fig. 8, and is equally applicable to the various modifications and variations of the first and second embodiments. In order to avoid narration, the same content is not repeated, but the main points are different.

Step S300, the serving base station BS600 and the cooperative base stations BS601, BS602 receive and measure the communication environment information.

The serving base station BS600 receives the channel state characteristic information (for example, CQI) fed back by the user equipment UE 610. The CQI fed back by the user equipment UE 610 in this embodiment includes the CQI of the own cell (the serving base station BS600 cell) detected by the user equipment UE610, and the coordinated base station BS601 cell. CQI, and CQI of the cooperative base station BS602 cell. The communication environment information of the serving base station BS600 and the cooperative base stations BS601, BS602 further includes OI information reflecting the ICI condition.

Step S301: The serving base station BS600 determines, according to the communication environment information, whether the user equipment UE610 enters the cooperation mode.

If the result of the determination is YES, the operation of step S302 is performed. If the result of the determination is negative, the operation of the non-cooperative mode is still performed, and the communication environment information is continuously received and measured.

Step S302, the serving base station BS600 and the cooperative base stations BS601, BS602 exchange communication environment information. .

The service communication base station BS600 and the cooperative base station BS 601 and the BS 602 exchange communication environment information including the ICI information of each radio cell and the CQI information of the serving cell BS 600, the cooperative base station BS 601 cell, and the cooperative base station BS 602 cell fed back by the user equipment UE 610. Step S303, the serving base station BS600 and the cooperative base stations BS 601 and BS 602 perform joint resource scheduling.

The serving base station BS600 and the cooperative base stations BS 601 and BS 602 perform joint resource scheduling based on the communication environment information, including uniformly considering respective communication environment information, uniformly allocating spectrum, power, and bit resources, and determining data transmission modes to be used by each. In this embodiment, the method of the joint processing/transmission single-user MIMO (CoMP-SU-MIMO) is adopted, that is, three base stations of the serving base station BS600 and the cooperative base station BS60K BS602 simultaneously transmit data to the user equipment UE 610, and at the same time, improve the receiving signal of the user equipment UE610. Quality and the purpose of inhibiting ICI.

Step S304, the serving base station BS600 and the cooperative base stations BS601 and BS602 exchange the information after the joint resource scheduling and the data that needs to be jointly transmitted.

The information after the joint resource scheduling includes the identification number (ID) of the serving base station BS600 and the cooperative base stations BS601, BS602 and the respective system bandwidth, the data transmission mode of the serving base station BS600 and the cooperative base stations BS601, BS602, the precoding matrix indication value, and the serving base station. The rank (Rank) and the used frequency band of the SU-MIMO system of the BS 600 and the cooperative base station BS60 BS602. The data that needs to be transmitted by the cooperative base station is the data that the serving base station BS 600 sends to the cooperative base stations BS 601 and BS 602 through the background communication, and the coordinated transmission data can be shared by the serving base station BS 600 and the cooperative base stations BS 601 and BS 602, and At the same time, transmission is performed to the user equipment UE 610.

Step S305, the serving base station BS600 and the cooperative base stations BS601 and BS602 perform power allocation and transmitter optimization, respectively.

Step S306, the serving base station BS600 and the cooperative base stations BS 601 and BS 602 send signaling and data to the user equipment UE 610 according to the jointly determined data transmission mode.

Step S307, the user equipment UE610 receives the signaling and data sent by the serving base station BS600 and the cooperative base stations BS601, BS602.

Step S308, the user equipment UE610 feeds back information to the serving base station BS600.

The CQI fed back by the user equipment UE610 includes the CQI of the CQI cooperative base station BS601 of the own cell detected by the user equipment UE610, and the CQI of the cooperative base station BS602. For the specific feedback method, reference may be made to the second embodiment described above.

Fourth Embodiment FIG. 14 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a fourth embodiment of the present invention. As shown in FIG. 14, the cooperative communication network according to the present embodiment includes a base station BS700 (serving base station), base stations BS701, BS702, BS703 (cooperative base station), and user equipment UE710, UE71 UE712, UE713. Fig. 15 is a detailed description of the implementation steps of the fourth embodiment.

The embodiment shown in Fig. 15 is substantially the same as the step shown in Fig. 8, and is equally applicable to the various modifications and variations of the first to third embodiments. In order to avoid narration, the same content is not repeated, but the main points are different.

Step S400, the serving base station BS700 and the cooperative base stations BS701, BS702, BS703 receive and measure the communication environment information.

The serving base station BS700 receives channel state characteristic information (e.g., CQI) fed back by the user equipment UE710-UE713, respectively. The processing of the user equipment UE710-UE713 is the same. Therefore, the user equipment UE710 is taken as an example for description. The CQI fed back by the user equipment UE710 in this embodiment includes the CQI of the local cell (BS700 cell) detected by the user equipment UE710, the CQI of the coordinated base station BS701 cell, the CQI of the coordinated base station BS702 cell, and the CQI of the coordinated base station BS703 cell. The communication environment information of the serving base station BS700 and the cooperative base stations BS701, BS702, BS703 further includes OI information reflecting the ICI condition.

Step S401: The serving base station BS700 determines, according to the communication environment information, whether each user equipment (for example, the UE 710) enters a cooperation mode.

If the result of the determination is YES, the operation of step S402 is performed. If the result of the determination is negative, the operation of the non-cooperative mode is still performed, and the communication environment information is continuously received and measured.

Step S402, the serving base station BS700 and the cooperative base stations BS701, BS702, and BS703 exchange the communication environment information.

The communication environment information exchanged between the serving base station BS700 and the cooperative base stations BS701, BS702, and BS703 includes ICI information of each radio cell, and the serving cell BS700 fed back by the user equipment UE710, and the cooperative base station BS701 cell, the cooperative base station BS702 cell, and the cooperative base station BS703 cell. CQI information.

Step S403, the serving base station BS700 and the cooperative base stations 701, 702, and 703 perform joint resource scheduling. The joint resource scheduling performed by the serving base station BS700 and the cooperative base stations BS701, BS702, and BS703 according to the communication environment information includes uniformly considering respective communication environment information, uniformly allocating spectrum, power, and bit resources, and determining a data transmission mode to be used by each of them. The user equipment feedback amount is reduced and the ICI interference is eliminated, thereby achieving the purpose of simultaneously improving the cell center data throughput and the cell edge data throughput.

In this embodiment, the method for jointly processing/transmitting multi-user MIMO (CoMP-MU-MIMO) is adopted, that is, the data transmission mode is that the four base stations through the serving base station BS700, the cooperative base stations BS701, BS702, and BS703 simultaneously transmit to the user equipment UE710, UE71 and UE712, The UE 713 transmits data, and at the same time, improves the user equipment UE 710, the UE 71 UE 712, and the UE 713 receives the signal quality and suppresses the ICI.

Step S404, the serving base station BS700 and the cooperative base stations BS701, BS702, and BS703 exchange the information after the joint resource scheduling and the data that needs to be jointly transmitted.

The information after the joint resource scheduling includes the identification number (ID) of the serving base station BS700 and the cooperative base stations BS701, BS702, BS703 and the respective system bandwidth, the IDs of the user equipments UE710, UE711, UE712, UE713 and their respective capabilities, the serving base station BS700 and The data transmission mode of the cooperative base stations BS701, BS702, and BS703, the Precoding Matrix Indicator (PMI), the rank (Rank) of the MU-MIMO system of the serving base station BS700 and the cooperative base stations BS701, BS702, and BS703. The frequency band is used. The data that needs to be jointly transmitted by the serving base station BS700 is sent to the cooperative base stations BS701, BS702, and BS703 by means of background communication, and data that needs to be cooperatively transmitted (including data to be transmitted to the user equipments UE710, UE71K, UE712, and UE713), The data to be cooperatively transmitted may be shared by the serving base station BS700 and the cooperative base stations BS701, BS702, BS703, and simultaneously transmitted to the user equipment UE710, UE71K UE712, UE713.

Step S405, the serving base station BS700 and the cooperative base stations BS701, BS702, and BS703 perform power allocation and transmitter optimization, respectively.

Step S406, the serving base station BS700 and the cooperative base stations BS701, BS702, BS703 cooperatively transmit signaling and data to the user equipment UE710, UE71K UE712. UE713.

Step S407: The user equipment UE710, UE711, UE712, and UE713 receive the signaling and data respectively sent by the serving base station BS700 and the cooperative base stations BS701, BS702, BS703, and BS704.

Step S408, the user equipment UE710, the UE71, the UE712. The UE713 feeds back information to the service. Base station BS700

[Fifth Embodiment]

Figure 16 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a fifth embodiment of the present invention. As shown in Fig. 16, the cooperative communication network according to the present embodiment includes base stations BS800, BS801 (serving base stations), base stations BS802 (cooperating base stations), and user equipments UE811, UE812 in the cells of the base stations BS800 and BS801, respectively. This embodiment describes a description of RRE cooperative communication and inter-cell RRE cooperative communication in a small area. Fig. 17 is a detailed description of the implementation steps of the fifth embodiment.

The embodiment shown in Fig. 17 is substantially the same as the step shown in Fig. 8, and is equally applicable to the various modifications and variations of the first to fourth embodiments. In order to avoid narration, the same content is not repeated, but the main points are different.

In step S500, the serving base stations BS800 and BS801 respectively receive and measure the communication environment information.

Step S501: The serving base stations BS800 and BS801 respectively determine, according to the communication environment information, whether the user equipments UE811 and UE812 of the respective cells enter the cooperation mode.

In this embodiment, the serving base station determines, according to the communication environment information, whether the user equipment enters the intra-cell cooperation mode or enters the inter-cell cooperation mode. If it is determined that the inter-cell cooperation mode is entered, the process proceeds to step S502. If it is determined to enter the intra-cell cooperation mode, the process proceeds to step S510, otherwise the non-cooperation mode operation is still performed, and the communication environment information is continuously received and measured.

In this embodiment, if the serving base station is in an environment where the ICI is low or the ICI is not restricted, but the CQI value of the user equipment is lower than the threshold, the serving base station determines that the user equipment enters the intra-cell cooperation mode (RRE cooperation), for example, Referring to the serving base station BS800 and the user equipment UE811 in Fig. 16, the flow proceeds to step S510.

In step S510, the serving base station BS800 exchanges the communication environment with the base station BS801 (or the base station BS802).

Step S511, the serving base station performs joint resource scheduling on the RRE 800-1 and the R E800-2, and sends the data to be cooperatively transmitted to the RRE 800-1 and the RRE 800-2 from the base station BS800 by using an optical fiber or the like. According to a variant of the embodiment, the serving base station BS800 can also perform joint resource scheduling for RRE 800-1 and R E800-2 directly according to the CQI and ICI information of the current cell.

Step S512, the RRE800-1 and the RRE800-2 respectively transmit the data and signaling to be cooperatively transmitted to the target user equipment UE811.

Step S513: The user equipment UE811 receives the data and signaling from the RRE800-1 and the RRE800-2, and performs a combining process, thereby improving the received signal quality of the user equipment UE811 and the edge data throughput of the cell.

Step S514, the user equipment UE811 feeds back information to RRE800-1 and RRE800-2.

On the other hand, if the serving base station is in an ICI-restricted or ICI-restricted environment, and the CQI value of the user equipment is lower than the threshold, the serving base station determines that the user equipment enters the inter-cell cooperation mode (RRE cooperation), for example, as shown in FIG. The serving base station BS 801, the cooperative base station BS 802, and the UE 812 are in progress, and the flow proceeds to step S502.

Step S502, the serving base station BS 801 and the cooperative base station BS 802 exchange communication environment information. The communication environment information exchanged between the serving base station BS 801 and the cooperative base station BS 802 includes ICI information of the serving base station BS 801 cell and the cooperative base station BS 802, the serving cell BS 801 fed back by the user equipment UE 811, and the CQI information of the cooperative base station BS 802 cell.

Step S503, the serving base station BS801 and the cooperative base station BS802 perform joint resource scheduling.

The joint resource scheduling performed by the serving base station BS 801 and the cooperative base station BS 802 according to the communication environment information includes uniformly considering respective communication environment information, uniformly allocating spectrum, power, and bit resources, and determining respective data transmission modes to be used to reduce users. The purpose of device feedback and elimination of ICI interference is to achieve the goal of simultaneously improving cell center data throughput and cell edge data throughput.

This embodiment adopts a cooperative remote radio equipment (RRE), that is, RRE801-1, RRE801-2 of the serving base station BS801 and RRE802-1, RRE802-2 of the cooperative base station BS802 in an environment with high ICI or ICI limitation. The cooperative transmission is performed, and at the same time, the quality of the received signal of the user equipment UE812 is improved, the edge data throughput is improved, and the ICI is suppressed.

Step S504, the serving base station BS801 and the cooperative base station BS802 exchange the information after the joint resource scheduling and the data that needs to be jointly transmitted.

The serving base station BS 801 and the cooperative base station BS 802 exchange the information after the joint resource scheduling and need to cooperate The data to be transmitted. The information after the joint resource scheduling includes the identification number (ID) of the serving base station BS 801 and the cooperative base station BS 802 and the respective system bandwidth, the data transmission mode of the serving base station BS 801 and the cooperative base station BS 802, the number of the RRE of the serving base station BS 801 and the cooperative base station BS 802, Use the frequency band. The data that needs to be jointly transmitted refers to the data that the serving base station BS 801 sends to the cooperative base station BS 802 by means of background communication.

Step S505, the serving base station BS801 and the cooperative base station BS802 perform power allocation and transmitter optimization, respectively.

Step S506, the serving base station BS 801 and the cooperative base station BS 802 send signaling and data to the user equipment UE 812.

The data to be jointly transmitted may be shared by the serving base station BS 801 and the cooperative base station BS 802, and simultaneously transmitted to the user equipment UE 812 through multiple RREs; or the data to be cooperatively transmitted may not be shared by the serving base station BS 801 and the cooperative base station BS 802. At one time, data is transmitted to the user equipment UE 812 by only one or more RREs of one base station.

Step S507, the user equipment UE812 receives the signaling and data sent by the serving base station BS 801 and the cooperative base station BS 802.

Step S508, the user equipment UE812 feeds back information to the serving base station BS801.

In this embodiment, the CQI fed back by the user equipment UE812 includes the CQI of the serving base station BS801 cell (serving cell) and the CQI of the cooperative base station BS802 cell (cooperative cell) detected by the user equipment UE812. Since the base station side has the CQI information of the serving cell and the coordinated cell at the same time, the resource scheduling can be performed by using a flexible scheduling algorithm in the joint resource scheduling to achieve the effect of improving the data throughput of the cell edge. Meanwhile, the user equipment needs to feed back the serving cell. And the CQI information of the coordinated cell increases the amount of information to be fed back, and correspondingly needs to occupy uplink resources, thereby increasing air overhead. On the other hand, the user equipment may also only feed back the CQI information of the serving cell or the coordinated cell, so that the amount of information to be fed back is small, and the air overhead is reduced, but the CQI information that can be used for joint resource scheduling is limited, and the best is not possible. Resource Scheduling.

In addition, in this embodiment, the user equipment feeds back the CQI information of the serving cell and the coordinated cell to the serving base station, so that only the uplink resource allocated by the serving base station is used, and the user equipment can also directly use the CQI information of the coordinated cell. Feedback to the cooperative base station, and the cooperative base station and the serving base station exchange communication environment information for joint resource scheduling, so as to avoid delay caused by background exchange, The timeliness is good, but the coordinating cell needs to allocate additional uplink resources.

Therefore, according to the trade-off relationship between the performance and the overhead of the foregoing system, the embodiment can flexibly adopt various feedback modes according to actual application requirements.

It should be noted that the various feedback methods described herein are applicable to the various embodiments and variations of the present invention.

In the present embodiment, only one cooperative base station BS802 is used as an example in the inter-cell cooperation process. However, in actual applications, the base station BS800 may be further used as a cooperative base station of the serving base station BS801.

[Sixth embodiment]

The conclusion of the 2007 World Wireless Conference concluded that the potential deployment bands for LTE-A include: 450-470MHz, 698-862MHz, 790-862MHz, 2.3-2.4GHz, 3.4-4.2GHz, 4.4-4.99GHz, etc. In addition to the 2.3-2.4 GHz frequency band commonly used in traditional cellular systems, the new frequency bands show a trend of high and low differentiation, especially for a large number of potential frequency bands concentrated in the higher frequency bands above 3.4 GHz. The high frequency band is characterized by significantly lower coverage, penetration capability, and mobility than the low frequency band, so it is only suitable for applications that provide discontinuous coverage and support low-speed mobility. Considering that the network of LTE-A is likely to be unevenly distributed in the future, most of the capacity requirements will focus on a small part of indoor and hotspot areas, which makes it possible for high-band applications. Moreover, the future LTE-A network is likely to be a multi-band cooperative cascading wireless access network, which will attract most of the system capacity by using a high-frequency band with a large amount of difference to specifically cover low-speed mobile users in indoor and hotspot areas. In the high frequency band, the low-band resources with low quality and low quantity are saved to cover the outdoor wide area and high-speed mobile users. As a result, low-band deployments can be seen as a complement to high-band deployments, which are responsible for filling areas that are not covered by high-band. In this way, multiple frequency bands are closely coordinated and complementary, which can effectively meet the dual needs of LTE-A system in terms of high capacity and wide coverage.

Therefore, for Coordinated Carrier Aggregation between cells, FIG. 18 is a schematic diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a sixth embodiment of the present invention. As shown in FIG. 18, the cooperative communication network according to the present embodiment includes a base station BS900 (serving base station), base stations BS901, BS902 (cooperating base station), and user equipment UE910. In this embodiment, it is assumed that there are five separate frequencies in the 100 MHz bandwidth. The bandwidth in the high and low frequency bands is 20MHz carrier aggregation unit frequency band (BW1-BW5). Fig. 19 is a detailed description of the implementation steps of the sixth embodiment.

The embodiment shown in Fig. 19 is substantially the same as the step shown in Fig. 8, and is equally applicable to the various modifications and variations of the first to fifth embodiments. In order to avoid narration, the same content is not repeated, but the main points are different.

Step S600, the serving base station BS900, the cooperative base station BS901, and the cooperative base station BS902 receive and measure the communication environment information.

The serving base station BS900 receives the channel state information CQI fed back by the user equipment UE 910, and the serving base station BS900, the cooperative base station BS901, and the cooperative base station BS902 respectively measure the ICI information (e.g., HII).

Step S601: The serving base station BS900 determines, according to the communication environment information, whether the user equipment UE910 enters the cooperation mode.

If the result of the determination is YES, the operation of step S602 is performed. If the result of the determination is negative, the operation of the non-cooperative mode is still performed, and the communication environment information is continuously received and measured.

If the ICI of the serving base station BS900 is higher than the threshold and/or the CQI of the user equipment UE910 detected by the serving base station BS900 is lower than the threshold, the serving base station BS900 determines that the user equipment UE910 enters the cooperative mode (inter-cell cooperation mode).

Step S602, the serving base station BS900 and the cooperative base stations BS901 and BS902 exchange communication environment information.

The communication environment information exchanged between the serving base station BS900 and the cooperative base stations BS901 and BS902 includes the ICI information of each radio cell and the CQI information of the cell where the serving base station BS900 and the coordinated base stations BS901 and BS902 are located fed back by the user equipment UE910.

Step S603, the serving base station BS900 and the cooperative base stations BS901, BS902 perform joint resource scheduling.

The joint resource scheduling performed by the serving base station BS900 and the cooperative base stations BS901 and BS902 according to the communication environment information includes uniformly considering the respective communication environment information, uniformly allocating the unit frequency bands of the carrier aggregation, and determining the data transmission mode to be used by each to reduce the user. The device feedback amount and the purpose of eliminating ICI interference, thereby improving the received signal quality of the cell edge user equipment UE 910 and the edge data throughput of the cell. As shown in FIG. 18, the specific manner of uniformly allocating the unit frequency band of the carrier aggregation is that the serving base station BS900, the cooperative base station BS901, and the cooperative base station BS902 respectively find out the few ICT segments that are the smallest ICI received according to the communication environment information, and use this Several unit carrier segments are used to transmit data to the user equipment UE 910. For example, the serving base station BS900 utilizes three carrier segments BW3, BW4 and BW5; the cooperative base station BS901 utilizes three carrier segments BW1, BW2 and BW3; and the cooperative base station BS902 uses three carrier segments BW2, BW3 and BW4.

The theoretical basis of this embodiment is that the future LTE-A system is a 100 MHz wideband system, but this 100 MHz wideband is not a continuous frequency band, but a combination of multiple carrier frequency bands in units of 20 MHz. In addition, the downlink data rates required by different user equipments are not the same. The downlink data is configured according to the requirements of the user equipment (UE Sepcific mode), and the base station does not use 100 MHz to transmit data to some user equipments. Therefore, In this embodiment, each base station selects a small component band of the ICI to cooperatively transmit data to the user equipment to improve the edge throughput and the received signal quality of the user equipment UE 910 while suppressing ICI.

Step S604, the serving base station BS900 and the cooperative base stations BS901 and BS902 exchange the information after the joint resource scheduling and the data that needs to be jointly transmitted.

The information after the joint resource scheduling includes the identification number (ID) of the serving base station BS900 and the cooperative base stations BS901, BS902 and the respective system bandwidth, the data transmission mode of the serving base station BS900 and the cooperative base stations BS901, BS902, the serving base station BS900 and the cooperative base station BS901, The identification number of the unit frequency band in which the carrier of the BS 902 is aggregated, and the specific sub-band of the unit frequency band in which each carrier is aggregated. The data that needs to be cooperatively transmitted is sent by the serving base station BS900 to the cooperative base stations BS901 and BS902 by means of background communication (central controller).

Step S605, the serving base station BS900 and the cooperative base stations BS901 and BS902 respectively perform power allocation and transmitter optimization.

Step S606, the serving base station BS900 and the cooperative base stations BS901, BS902 send signaling and data to the user equipment UE910.

The cooperatively transmitted data may be shared by the serving base station BS900 and the cooperative base stations BS901, BS902, and simultaneously transmitted to the user equipment UE910; or the cooperatively transmitted data is not shared by the serving base station BS900 and the cooperative base stations BS901, BS902, but only at a certain time The data is transmitted to the user equipment UE 910 through a unit frequency band in which one or more carriers are scheduled by one base station. Step S607: The user equipment UE910 receives the signaling and data sent by the serving base station BS900 and the cooperative base stations BS901 and BS902.

Step S608, the user equipment UE910 feeds back information to the serving base station BS900.

[Seventh embodiment]

In the standard document 3GPP TR 36.814 on LTE-A technology, although the seventh chapter states that the downlink transmission scheme is supported, the eighth chapter states that the multi-point transmission (CoMP) scheme is supported, but it is considered to introduce too many transmission or reception schemes. Will increase the complexity of system design or implementation. Therefore, the inventors of the present invention have studied the common features of the downlink transmission scheme and the CoMP transmission scheme, and proposed a combination scheme between the two in the present embodiment to uniformly solve the joint problem of the two.

For a combination scheme of CoMP and downlink transmission between cells, FIG. 20 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to a seventh embodiment of the present invention. As shown in Fig. 20, the cooperative communication network according to the present embodiment includes a base station BS1100 (serving base station), base stations BS1101, BS1102 (cooperating base station), and a cell center user equipment UE1110, and a cell edge user equipment UE1111. Fig. 21 details the implementation steps of the seventh embodiment.

The embodiment shown in Fig. 21 is substantially the same as the step shown in Fig. 8, and is equally applicable to the various modifications and variations of the first to sixth embodiments. In order to avoid narration, the same content is not repeated, but the main points are different.

Step S700, the serving base station BS1100, the cooperative base station BS1101, and the cooperative base station BS1102 receive and measure the communication environment information.

The serving base station BS1100 receives channel state information (CSI) fed back from the user equipment UE1110 and UE1111, and the serving base station BS1100, the cooperative base station BS1101, and the cooperative base station BS1102 respectively measure the ICI information. The CSI information fed back by the cell center user equipment UE1110 does not include the CSI information of the cell where the cooperative base station BS1101 is located and the cell where the cooperative base station BS1102 is located. The CSI information fed back by the cell edge user equipment UE1111 includes the cell where the cooperative base station BS1101 is located and the cooperative base station BS1102. CSI information of the cell in which it is located.

Step S701: The serving base station BS1100 determines whether the user equipment (including the UE 1110 and the UE 1111) enters the cooperation mode.

If the result of the determination is yes, the operation of step S702 is performed, and if the result of the determination is negative, the non-performation is still performed. The operation of the cooperative mode while continuing to receive and measure the communication environment information.

If the ICI of the serving base station BS1100 is higher than the threshold and/or the CSI of the user equipment (for example, UE1 lll) received by the serving base station BS1100 is lower than the threshold, the serving base station BS1100 determines that the user equipment UE1111 enters the cooperative mode, for example, FIG. The serving base station BS1100, the cooperative base stations BS1101, and the BS1102 perform cooperative transmission on the user equipment UE1111.

Step S702, the serving base station BS1100 and the cooperative base stations BS1101, BS1102 exchange communication environment information.

The communication base station BS1100 and the cooperative base stations BS1101 and BS1102 exchange communication environment information including ICI information of each radio cell, and CSI information of the cell where the serving base station BS1100 is located and the cell where the cooperative base stations BS1101 and BS1102 are located fed back by the user equipment UE1111.

Step S703, the serving base station BS1100 and the cooperative base stations BS1101, BS1102 perform joint resource scheduling.

The joint resource scheduling performed by the serving base station BS1100 and the cooperative base stations BS1101 and BS1102 according to the communication environment information includes uniformly considering the respective communication environment information, uniformly allocating the unit frequency bands of the carrier aggregation, and determining the data transmission mode to be used by each to reduce the user. The device feedback amount and the purpose of eliminating ICI interference, thereby improving the received signal quality of the user equipment and the edge data of the cell. When the serving base station BS1100 has judged that the user equipment UEllll enters the cooperative mode, the downlink transmission and CoMP are uniformly considered as follows. .

It is considered that the cell edge user equipment UE11l enters the cooperative mode because the quality of the channel state of the user equipment UE1111 is too poor or the ICI is too large, resulting in the data rate of the user equipment UE1111 being too low. Therefore, the present embodiment improves the received signal quality of the cell edge user equipment UE1111 and the edge data throughput of the cell by increasing the number of transmitting antennas, that is, by the higher order MIMO transmission mode, and simultaneously suppressing the excessive ICI. That is to say, for example, the data throughput of the cell center user equipment UE1110 can be implemented by using a downlink MIMO transmission scheme of 8 rounds and 8 rounds, but because the channel of the cell edge user equipment UE1111 is too poor, downlink MIMO transmission is performed by 8 rounds and 8 rounds. The solution cannot meet the data throughput of the cell edge user equipment UEll11. Therefore, the serving base station BS1100 can adopt the downlink MIMO scheme of 4 rounds and 4 receivers, but the two cooperative base stations BS1101 and BS1102 respectively adopt the downlink MIMO scheme of 4 rounds and 4 rounds. In this way, The cell edge user equipment UE1111 is a downlink MIMO scheme of 12 rounds and 12 rounds. Therefore, the data throughput of the cell edge user equipment UE1111 can be greatly improved.

This example adopts the combination of CoMP and downlink transmission, and uses CoMP as a special downlink transmission scheme to improve the edge throughput and received signal quality of UE1111 and suppress ICI through cooperation between signaling.

Step S704, the serving base station BS1100 and the cooperative base stations BS1101, BS1102 exchange the information after the joint resource scheduling and the data that needs to be jointly transmitted.

The information after the joint resource scheduling includes the identification number (ID) of the serving base station BS1100 and the cooperative base stations BS1101, BS1102 and the respective system bandwidth, the data transmission mode of the serving base station BS1100 and the cooperative base station BS110 BS1102, the serving base station BS1100 and the cooperative base station BS110 BS1102. The PMI of MIMO, the rank of MIMO, the identification number of the unit band of the coordinated carrier aggregation of the serving base station BS1101 and the cooperative base stations BS1101, BS1102, and the specific sub-band of the unit band aggregated by each carrier. The data that needs to be cooperatively transmitted is sent by the serving base station BS1100 to the cooperative base stations BS1101 and BS1102 by means of background communication (central controller).

Step S705, the serving base station BS1000 and the cooperative base stations BS1001, BS1002 perform power allocation and transmitter optimization, respectively.

Step S706, the serving base station BS1100 and the cooperative base stations BS1101, BS 1102 send signaling and data to the user equipment UE1111.

The cooperatively transmitted data may be shared by the serving base station BS1100 and the cooperative base stations BS1101, BS1102, and simultaneously transmitted to the user equipment UE1111; or the cooperatively transmitted data may not be shared by the serving base station BS1100 and the cooperative base stations BS1101, BS1102, but at a time Data is transmitted to the user equipment UE 1111 only through a unit frequency band in which one or more carriers of one base station are aggregated.

Step S707: The user equipment UE1111 receives the signaling and data sent by the serving base station BS1100 and the cooperative base stations BS1101, BS1102.

Step S708, the user equipment UE1111 feeds back information to the serving base station BS1100.

[Eighth Embodiment]

According to the standardized document 3GPP TR 36.814 of the LTE-A technology, this embodiment is directed to inter-cell The uplink CoMP scheme is described. FIG. 22 is a diagram showing a multi-base station cooperative communication method based on communication environment information and scheduling information according to an eighth embodiment of the present invention. As shown in FIG. 22, the cooperative communication network according to the present embodiment includes a base station BS 1200 (serving base station), a base station BS 1201 (cooperative base station), and a user equipment UE 1210. Fig. 23 is a detailed description of the implementation steps of the eighth embodiment.

Step S800, the serving base station BS1200 and the cooperative base station BS1201 receive and measure the communication environment information.

The serving base station BS1200 and the cooperative base station BS1201 receive and detect the uplink channel state information (CSI) of the serving cell where the user equipment UE1210 is located by using a sounding reference sequence (SRS) to fully utilize the uplink channel state information (CSI). The performance of the uplink collaboration system. The serving base station BS1200 and the cooperative base station BS1201 respectively perform ICI information to step S801, and the serving base station BS1200 determines whether the user equipment UE1210 enters the cooperative mode. If the ICI of the serving base station BS1200 is higher than the threshold and/or the uplink of the user equipment UE1210

If the CSI is lower than the threshold, the serving base station BS1200 determines that the user equipment UE1210 enters the uplink cooperative mode, and proceeds to step S802. Otherwise, it returns to step S800.

Step S802, the serving base station BS1200 and the cooperative base station BS1201 exchange communication environment information. The serving base station BS1200 and the cooperative base station BS1201 exchange communication environment information including ICI information of each radio cell, and the serving base station BS1200 cell and the cooperative base station fed back by the user equipment UE1210.

CSI information of the BS 1201 cell.

Step S803, the serving base station BS1200 and the cooperative base station BS1201 perform joint resource scheduling. The joint resource scheduling performed by the serving base station BS1200 and the cooperative base station BS1201 according to the communication environment information includes unified consideration of respective communication environment information, allocation and scheduling of uplink spectrum resources, so as to reduce the feedback amount of the user equipment and eliminate the interference of the ICI, thereby Improve service base station

The received signal quality of the BS1200 and the cooperative base station BS1201 and the uplink data throughput of the cell edge. For example, the serving base station and the cooperative base station jointly determine the subcarrier group or resource block used by the user equipment to transmit uplink data.

Step S804, the serving base station BS1200 and the cooperative base station BS1201 exchange the information after the joint resource scheduling. The information after joint resource scheduling includes an identification number (ID) of the serving base station BS1200 and the cooperative base station BS1201 and respective system bandwidths, and uplink frequency band resources respectively allocated to the user equipment by the serving base station and the cooperative base station.

Step S805, the serving base station BS1200 sends scheduling information (collaboration information) to the user equipment UE1210.

The cooperation information transmitted by the serving base station BS1200 to the user equipment UE1210 mainly includes resource allocation information of the serving base station BS1200 and resource allocation information of the cooperative base station BS1201.

Step S806, the user equipment UE1210 optimizes the uplink transmitter according to the resource allocation information of the serving base station BS1200 and the resource allocation information of the cooperative base station BS1201, including uplink transmission mode selection, power allocation, bit allocation, feedback mode selection, and the like.

Step S807, in the case that the cooperation information indicates that the cooperation mode is the intra-cell cooperation mode, the user equipment UE1210 sends signaling and data to the RRE1200-1 and the RRE1200-2, respectively, and proceeds to step S808, where the serving base station BS1200 is from the RRE1200-1. And the data of the RRE1200-2 is combined to obtain the uplink data sent by the user equipment UE1210.

Step S809: When the cooperation information indicates that the cooperation mode is the inter-cell cooperation mode, the serving base station BS1200 and the cooperative base station BS1201 receive the signaling and data sent by the user equipment UE1210.

Here, the user equipment UE1210 implements uplink cooperative data transmission through RRE1200-1, RRE 1200-2, and RRE1201-RRE1201-2.

In step S810, the serving base station BS1200 and the cooperative base station BS1201 perform data exchange again, so that the uplink data transmitted by the user equipment UE1210 is merged in the serving base station BS1200.

Ninth Embodiment

Figure 24 is a diagram showing a specific structure of a base station based on communication environment information and scheduling information according to the present invention.

As shown in FIG. 24, the base station of the present invention includes a transceiver unit 21, a communication environment information receiving and measuring unit 22, a cooperation mode determining unit 23, a data processing unit 24, an exchange unit 25, a resource scheduling unit 26, and a power allocation and optimization unit 27 .

The base station according to the present embodiment can implement the functions of the serving base station and the cooperative base station of the present invention, For details, please refer to the following examples. For details, refer to the above embodiments. Further, the above unit structure may form a single or other unit structure by a combination.

Transceiver unit 21 receives data and signaling from the user equipment or neighboring base stations and transmits data and signaling to the user equipment.

The communication environment information receiving and measuring unit 22 obtains channel state characteristic information (e.g., CQI, CSI, etc.) and neighbor cell interference information ICI based on data from the transceiver unit 21. At the same time, the data processing unit 24 performs processing such as down-conversion, sampling, channel estimation, data detection, data demodulation, and the like on the received data.

The cooperation mode judging unit 23 judges whether or not the user equipment enters the cooperation mode based on the obtained communication environment information. Here, it should be noted that, as described in the previous embodiment, there are various ways to determine whether to enter the cooperative mode, and the determination may not be made based on the communication environment information. Alternatively, the cooperation mode may be entered directly according to the request of the user equipment, thereby omitting the cooperation mode determination unit 23.

In the case of judging entry into the cooperative mode, the switching unit 25 exchanges data that needs to be exchanged with the neighboring cell (cooperative cell) via the transceiving unit 21 or directly with the cooperating cell. For example, the overload information (OI) is directly transmitted between the base stations. Therefore, the communication environment information exchanged by the switching unit 25 is not necessarily all the information obtained by the communication environment information receiving and measuring unit 22, but is corresponding according to the actual communication system. The change.

The resource scheduling unit 26 performs unified joint resource scheduling (including uplink and/or downlink resource allocation) together with the cooperative base station based on the exchanged communication environment information. In the downlink cooperative communication, the data transmission mode of each base station and the data that needs to be cooperatively transmitted will be further determined.

The switching unit 25 further exchanges scheduling information after resource scheduling with the coordinated cell. In downlink cooperative communication, switching unit 25 will also exchange data that needs to be collaboratively transmitted to the user equipment.

The power distribution and optimization unit 27 performs power allocation on the data that needs to be cooperatively transmitted, and performs transmission optimization processing (including adjusting the antenna angle of the transmitter, the number of antennas, the transmission power, etc.), and then transmitting it to the user by the transceiver unit 21. device.

It is to be noted that, in the uplink cooperative communication, after the transceiver unit 21 sends the scheduling information to the user equipment, the user equipment separately sends the data to the serving base station and the cooperative base station according to the scheduled uplink resource information. Then, the switching unit 25 exchanges uplink data sent by the user equipment with the cooperative base station, and performs a combining process by the data processing unit 24, thereby implementing uplink data cooperative communication. In addition, when the cooperation mode determining unit 23 determines that the user equipment enters the intra-cell cooperation mode, the serving base station completes downlink or uplink cooperative communication only through the RRE device in the serving cell.

[Tenth embodiment]

Figure 25 is a diagram showing the detailed structure of a user equipment based on communication environment information and scheduling information according to the present invention.

In order to avoid redundancy, only the structure of the user equipment is exemplified herein. For the specific operation procedure, refer to the foregoing embodiments.

As shown in FIG. 25, the user equipment according to the present invention includes a transceiver unit 31, a data processing unit 32, a cooperation information acquisition unit 33, and a transmitter optimization unit 34.

Transceiver unit 31 receives data signaling from the base station and transmits data and signaling to the base station.

The data processing unit 32 processes the received data, including down conversion, sampling, channel estimation, data detection, and the like. Here, the data processing unit 32 may further acquire information related to the communication environment information and feed back to the base station via the transceiving unit 31.

The cooperation information acquiring unit 33 acquires the cooperation information from the processed data, including the information indicating that the user equipment enters the cooperation mode by the serving base station, and the scheduling information after the serving base station and the cooperative base station jointly perform resource scheduling. After the cooperation information includes indicating that the user equipment enters the downlink cooperation mode, after the serving base station and the cooperative base station cooperate to perform downlink data transmission, the data processing unit 32 performs data from the serving base station and the cooperative base station according to the scheduling information from the serving base station. Merging processing; in the case where the cooperation information includes instructing the user equipment to enter the uplink cooperation mode, the corresponding processing is performed by the transmitter optimization unit 34.

The transmitter optimization unit 34 optimizes the uplink transmitter according to the cooperation information, including uplink transmission mode selection, power allocation, bit allocation, feedback mode selection, etc., and optimizes the data to be transmitted via the transceiver unit 31. The serving base station and the cooperative base station transmit.

It is worth noting that, in the case where the cooperation information includes indicating that the user equipment enters the intra-cell cooperation mode, the transceiving unit 31 transmits data only to the RRE device in the serving cell, or only receives data from the RRE device in the serving cell.

[Eleventh Embodiment] Figure 26 is a diagram showing the structure of a communication system based on communication environment information and scheduling information according to the present invention.

As shown in Fig. 26, the communication system according to the present embodiment includes: a child node, a center node, and a connection line. In the present invention, the serving base station can be regarded as a central serving node, and the cooperative base station is regarded as a central cooperative node.

The child node is a basic unit constituting a communication system, and may be various mobile or fixed communication terminals, and may be a device that is a medium or a carrier by wireless communication methods such as radio waves, Bluetooth, infrared, or the like, or may be an optical fiber, a cable, or a power line. A device that uses a wired communication method to make a medium or a carrier. Specific types include user equipment, personal communication equipment or in-vehicle communication equipment, sensors of wireless sensor networks, detectors, and the like.

A central node is the basic unit that constitutes a communication system for managing, monitoring, and controlling child nodes. The central node may be various mobile or fixed communication systems or devices, such as a serving base station, a cooperative base station, a repeater, a central controller of an ad hoc network, etc.; or may be a primary node of a wireless sensor network and other communication systems. The node that acts.

The connection line is a medium or medium for connecting various central nodes, and may be a wireless medium or medium, or a wired medium or medium.

The specific cooperative communication process between the child node and the central node can refer to any of the above embodiments. It is to be noted that the processing performed by the cooperative communication method, the base station, the user equipment, and the communication system according to the present invention may be executed by a CPU or other arithmetic means by executing a computer program included in a ROM (Read Only Memory), RAM or other storage medium. The control communication interface device, the input/output device, or the display device is specifically implemented.

Accordingly, various processes and functions performed by the cooperative communication method, base station, user equipment, and communication system in accordance with the present invention may be implemented only by a computer configured to read a storage medium containing the program. Quality and execution. In addition, the removable storage medium containing the program can implement various functions and processes described above on any computer.

The computer program storage medium may be a memory such as a ROM so that the program can be executed on the micro computer. Alternatively, it may be a program storage medium readable when loaded into an external storage device (program reading device, etc.).

Additionally, it is preferred that the stored program be accessible by the microcomputer. Moreover, preferably, the program can be read and downloaded to a program storage area in the microcomputer that performs the operation.

The storage medium may be, for example, a tape such as a magnetic tape or a tape cassette, a disk including a floppy disk or a hard disk, and a disk such as a CD-ROM, a MO, an MD, a DVD, a CD-R, or the like, and an IC card (including storage). Cards, cards such as optical cards, or semiconductor memories such as mask ROMs, EPROMs, EEPROMs, and flash ROMs.

As described above, the embodiment of the present invention provides a cooperative communication method based on communication environment information and scheduling information, a base station, a user equipment, a communication system, a program, and a storage medium, and the serving base station and the cooperative base station pair the cellular according to the communication environment information and the scheduling information. The wireless communication system performs reasonable coordination and scheduling, and has the characteristics of simple design, comprehensiveness, high efficiency and flexibility. Therefore, the cooperative communication method based on the communication environment information and the scheduling information, the base station, the user equipment, the communication system, the program, and the storage medium, which are proposed in the field of wireless transmission technology, may be a third type for various wireless or mobile networks. Generation cellular mobile network (3G), super three generation cellular mobile network (S3G, B3G), fourth generation cellular mobile network (4G), single frequency broadcast network (SFN), wireless local area network (WLAN), wireless wide area network (WWAN), multimedia Broadcast multicast service network (MBMS), ad hoc network (Mesh, Ad Hoc, Censor Network). The cooperative communication problem of digital home network (e-Home) and other systems provides important theoretical basis and specific implementation methods.

According to the specific embodiments and various modifications described above, the present invention provides a cooperative communication method based on communication environment information and scheduling information, including the steps of:

For the user equipment entering the cooperative mode in the serving cell, the serving base station and the at least one cooperative base station exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, where the communication environment information includes at least channel state characteristic information reflecting channel state characteristics and The neighboring cell interference information; and the serving base station and the cooperative base station exchange the scheduling information after the joint resource scheduling, and perform cooperative data transmission according to the scheduling information. According to the specific embodiments and various modifications described above, the present invention provides a base station for implementing cooperative communication, which includes a transceiver unit, a communication environment information receiving and measuring unit, a switching unit, and a resource scheduling unit.

The transceiver unit receives and transmits data and signaling; the communication environment information receiving and measuring unit measures the obtained communication environment information according to the data received by the transceiver unit, and the communication environment information includes at least channel state characteristic information reflecting the channel state characteristic and the adjacent cell interference information. The switching unit exchanges communication environment information with the neighboring base station; the resource scheduling unit performs joint resource scheduling for the user equipment entering the cooperative mode according to the exchanged communication environment information, and the transceiver unit and the neighboring base station according to the scheduling information after the joint resource scheduling Collaborate on data transfer.

According to the specific embodiments and various modifications described above, the present invention provides a user equipment for implementing cooperative communication, which includes a transceiver unit, a data processing unit, and a collaboration information acquisition unit.

The transceiver unit receives and transmits data and signaling; the data processing unit processes the received data; the cooperation information acquiring unit acquires cooperation information from the processed data, where the cooperation information includes scheduling information after the resource base station and the cooperative base station jointly perform resource scheduling, and The data processing unit further acquires information related to the communication environment information, and feeds back to at least one of the serving base station and the cooperative base station via the transceiver unit, where the communication environment information includes at least channel state characteristic information reflecting the channel state characteristics and neighbor cell interference information.

According to the specific embodiments and various modifications described above, the present invention provides a communication system for implementing cooperative communication, the communication system including a serving base station, a cooperative base station, and a user equipment, wherein the service base station and the cooperative base station have the same structural configuration .

The user equipment includes a transceiver unit, a data processing unit, and a collaboration information acquisition unit. The transceiver unit receives data and signaling; the data processing unit processes the received data; The acquiring unit obtains the cooperation information from the processed data, where the cooperation information includes scheduling information after the resource base station and the cooperative base station jointly perform resource scheduling; and the data processing unit further acquires information related to the communication environment information, and feeds back to the serving base station via the transceiver unit. And at least one of the cooperative base stations, the communication environment information includes at least channel state characteristic information reflecting the channel state characteristics and neighbor cell interference information.

According to the above specific embodiments and various modifications, the present invention provides a communication system for implementing cooperative communication, the communication system including a child node and a central service node and a central collaboration node, wherein

For the child node of the cell in the cooperative mode that is located in the cell where the central serving node is located, the central service node and the at least one central cooperative node exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, and the communication environment information at least includes reflecting the channel state. Characteristic channel state characteristic information and neighbor cell interference information; and the central service node and the central cooperative node exchange scheduling information after resource scheduling, and perform cooperative data transmission according to the scheduling information.

According to the specific embodiments and various modifications described above, the present invention provides a program for cooperative communication such that a serving base station and at least one computer on the cooperative base station side perform steps:

For the user equipment entering the cooperative mode in the serving cell, the serving base station and the at least one cooperative base station exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, where the communication environment information includes at least channel state characteristic information reflecting channel state characteristics and The neighboring cell interference information; and the serving base station and the cooperative base station exchange the scheduling information after the joint resource scheduling, and perform cooperative data transmission according to the scheduling information.

According to the specific embodiments and various modifications described above, the present invention provides a program for cooperative communication such that a computer on the user equipment side performs steps:

Receiving and transmitting data and signaling; processing the received data; acquiring cooperation information from the processed data, the cooperation information includes scheduling information after the resource base station and the cooperative base station jointly perform resource scheduling, and acquiring information related to the communication environment information, And feeding back to at least one of the serving base station and the cooperative base station, where the communication environment information includes at least channel state characteristic information that reflects channel state characteristics and neighbor cell interference information.

According to the specific embodiments and various modifications described above, the present invention provides a storage medium on which a cooperative communication program based on communication environment information and scheduling information is combined, so that the serving base station and The computer of the at least one coordinated base station performs the following steps: for the user equipment entering the cooperative mode in the serving cell, the serving base station and the at least one cooperative base station exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, where the communication environment information includes at least Channel state characteristic information reflecting channel state characteristics and neighbor cell interference information; and the serving base station and the cooperative base station exchanging scheduling information after joint resource scheduling, and performing cooperative data transmission according to the scheduling information.

According to the specific embodiments and various modifications described above, the present invention provides a storage medium on which a cooperative communication program based on communication environment information and scheduling information is combined, so that the computer on the user equipment side performs the steps:

Based on the above inventive concept, the present invention may further provide a network cooperation method based on communication environment information and scheduling information, including the following steps:

Step 1: The base station measures or detects the communication environment information;

Step 2: The serving base station determines whether the user equipment enters the cooperative mode and takes corresponding operations. Step 3: The serving base station and the cooperative base station exchange communication environment information.

Step 4: The serving base station and the cooperative base station perform joint resource scheduling;

Step 5: The serving base station and the cooperative base station exchange the information after the joint resource scheduling and the data that needs to be transmitted cooperatively;

Step 6: The serving base station and the cooperative base station respectively perform transmission mode selection, power allocation, and transmitter optimization;

Step 7: The base station sends data and/or signaling to the user equipment.

Step 8: The user equipment receives data and/or signaling sent by the serving base station and the coordinated base station. Step 9: The user equipment feeds back information to the corresponding base station.

The present invention can implement dynamic switching mechanism or semi-static switching mechanism of downlink control information (DCI) by using signaling of a physical downlink control channel (PDCCH), signaling of a broadcast channel (BCH), or higher layer (L3) signaling. The user equipment feeds back information to the base station through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

The present invention can further combine the non-cooperative transmission mode and the cooperation-based transmission mode into a unified transmission mode, and both the downlink and the uplink can adopt a unified transmission mode.

Based on the above inventive concept, the present invention may further provide a base station for cooperative communication method based on communication environment information and scheduling information, which may include a radio frequency unit, a receiving unit, a measuring unit, a judging unit, a switching unit, and a resource scheduling. Unit, transmission mode selection unit, power distribution unit, transmitter optimization unit transmission unit, feedback unit, and fiber port unit.

The receiving unit processes data from the radio unit, and the processing includes down conversion, sampling, channel estimation, data detection, data demodulation, and the like.

The measuring unit measures or detects data or signaling to find communication environment information information for cooperation between multiple base stations and cooperation between the base station and the user equipment.

The judging unit judges whether the user equipment enters the cooperation mode between the plurality of base stations according to the communication environment information.

The switching unit exchanges communication environment information, scheduling information, and coordinated data information with the cooperative base station. The resource scheduling unit allocates and schedules spectrum resources.

The transmission mode selection unit selects the mode in which the data is transmitted correctly.

The power distribution unit performs power allocation on the data.

The transmitter optimization unit transmitting unit adjusts the antenna angle, the number of antennas, and the transmission power of the transmitter.

The feedback unit sends the feedback information to the user equipment.

The radio unit receives uplink data or signaling signals and transmits downlink data and/or signals to the user equipment.

The fiber port unit exchanges communication environment information, scheduling information, and cooperation data between base stations that cooperate with each other.

Based on the above inventive concept, the present invention may further provide a user equipment based on a cooperative communication method of communication environment information and scheduling information, including a receiving unit, a listening unit, a determining unit, a demodulating unit, and a data processing unit. Transmitter optimization unit, transmitting unit, feedback unit and radio unit. The receiving unit processes the data from the radio unit, and the processing includes down conversion, sampling, channel estimation, data detection, and the like.

The listening unit listens for cooperation information of the serving base station or the cooperative base station.

Judging unit: judging whether the user equipment enters a multi-base station cooperation manner according to the cooperation information. The demodulation unit demodulates the data of the receiving unit;

The data processing unit processes the demodulated data, including allocating and scheduling uplink spectrum resources.

The transmitter optimization unit optimizes the uplink transmitter, including uplink transmission mode selection, power allocation, bit allocation, and feedback mode selection.

The transmitting unit sends data and signaling to the base station.

The feedback unit sends the feedback information to the base station.

The radio unit receives downlink data and/or signaling and transmits uplink data and/or signaling to the base station.

The cooperative communication method and communication system based on communication environment information and scheduling information according to the present invention have the characteristics of comprehensive application, reasonable design, simple and high efficiency. Moreover, the cooperative communication method, the base station, the user equipment, the communication system, the program, and the storage medium based on the communication environment information and the scheduling information provided by the present invention may be correspondingly changed according to actual conditions, and may be the third generation.

(3G), super three generations (S3G, LTE), fourth generation (4G) cellular mobile communications and digital television, wireless local area network (WLAN), self-organizing network (Mesh, Ad Hoc, Censor Network), digital home network (e- Home), home base station network (Home eNodeB), wireless wide area network (WWAN) and other systems network design, layout, installation, collaboration, and operational solutions provide important theoretical basis and specific implementation methods.

The invention has thus far been described in connection with the preferred embodiments. It will be appreciated that various other changes, substitutions and additions can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention is not limited to the specific embodiments described above, but is defined by the appended claims.

Claims

Claim

A cooperative communication method based on communication environment information and scheduling information, characterized in that it comprises the steps of:

For the user equipment entering the cooperative mode in the serving cell, the serving base station and the at least one cooperative base station exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, where the communication environment information includes at least channel state characteristics reflecting channel state characteristics Information and neighbor cell interference information;

2. The cooperative communication method according to claim 1, further comprising:

The serving base station determines, according to the communication environment information, whether the user equipment enters a cooperation mode.

3. The cooperative communication method according to claim 1, wherein

The communication environment information includes channel quality indication information, channel state information, an overload indication reflecting a neighboring cell interference condition, a high interference indication, a quality of service parameter reflecting a wireless cell working condition, a signal to interference and noise ratio, and a pre-processing for the MIMO system. Encoding matrix indication, rank for MIMO system, acknowledgment/non-response for hybrid retransmission request, scheduling request, path loss, geographic location, shadow fading information, motion speed of user equipment, received signal size indication, reference signal reception Power, reference signal reception quality, at least two pieces of information reflecting the peak-to-average ratio of the uplink quality, the fallback, and the arrival angle of the uplink.

4. The cooperative communication method according to claim 1, wherein

The scheduling information includes an identification number of the serving base station and the cooperative base station, a respective system bandwidth, an identification number of the user equipment as a cooperative communication target, and an capability of the user equipment, an identification number of a unit frequency band in which the carrier is aggregated, a serving base station, and a cooperative base station. Transmit mode information, at least one of a configured frequency band, a subband, a resource block/a resource block group, and a resource unit of a radio cell in which the serving base station and the cooperative base station are located.

5. The cooperative communication method according to claim 1, further comprising:

The user equipment feeds back the channel shape to at least one of the serving base station and the cooperative base station State characteristic information and the neighbor cell interference information.

6. The cooperative communication method according to claim 1, further comprising:

The serving base station and the cooperative base station exchange data that needs to be jointly transmitted, and jointly transmit data to the user equipment according to the scheduling information, where the scheduling information includes downlink resource information after joint resource scheduling;

The user equipment combines data that is jointly transmitted by the serving base station and the cooperative base station.

7. The cooperative communication method according to claim 1, further comprising:

The serving base station sends the scheduling information to the user equipment, where the scheduling information includes uplink resource information after joint resource scheduling;

The user equipment performs uplink data transmission according to the scheduling information.

8. The cooperative communication method according to claim 6, wherein

The joint resource scheduling includes uniformly allocating spectrum, power, and bit resources according to the exchanged communication environment information, and determining a data transmission mode to be used by each base station.

9. The cooperative communication method according to claim 8, wherein

The data transmission mode of the serving base station and the data transmission mode of the cooperative base station are a data multiplexing relationship, a diversity relationship, a multiplexing and diversity combination relationship, or a joint coding relationship.

10. The cooperative communication method according to claim 2, wherein

In the case that it is determined that the user equipment enters the non-cooperative mode from the cooperative mode, or enters the cooperative mode from the non-cooperative mode, the serving base station transmits physical layer control signaling through a physical downlink control channel, or delivers a broadcast through a broadcast channel. The signaling implements a dynamic switching mechanism between the cooperative mode and the non-cooperative mode, or delivers the high-level signaling through the physical downlink shared channel to implement a semi-static switching mechanism between the cooperative mode and the non-cooperative mode.

11. The cooperative communication method according to claim 10, wherein

The serving base station divides the cooperative mode and the non-cooperative mode by using one bit in the downlink control information.

12. The cooperative communication method according to claim 1, wherein

The exchange communication environment information includes three ways of completely sharing the communication environment information, partially sharing the communication environment information, and sharing the communication environment information, and

Exchange scheduling information includes fully shared scheduling information, partial shared scheduling information, and no shared scheduling Information in three ways.

13. The cooperative communication method according to claim 1, wherein

The cooperative communication method is based on: the serving base station and the cooperative base station have only a single hop capability; the user equipment accepts cooperation from two coordinated base stations that are adjacent to each other at most; the cell edge user equipment adopts a multi-base station cooperation manner, the cell The central user equipment does not adopt a multi-base station cooperation manner; the user equipment in the cooperative mode only feeds back at least one of the principles to the serving base station.

14. The cooperative communication method according to claim 5, wherein

The manner in which the user equipment feeds back the channel state characteristic information is: (1) the user equipment feeds back channel state characteristic information in the serving cell only to the serving base station, and (2) the user equipment only refers to the The serving base station feeds back channel state characteristic information in the serving cell and the coordinated cell, or (3) the user equipment feeds back channel state characteristic information in the serving cell and the coordinated cell to the serving base station and the cooperative base station, respectively.

15. The cooperative communication method according to claim 8, wherein

The data transmission mode is a method in which interference coordination is combined with uplink power control, and data transmission is a time division multiplexing relationship.

16. The cooperative communication method according to claim 8, wherein

The data transmission mode is a cooperative beamforming mode, and the data transmission is a time division multiplexing relationship.

17. The cooperative communication method according to claim 8, wherein

The data transmission mode is that the serving base station and the cooperative base station simultaneously transmit data to the user equipment in cooperation.

18. The cooperative communication method according to claim 8, wherein

The data transmission mode is that the serving base station and the cooperative base station simultaneously transmit data to a plurality of user equipments in cooperation.

19. The cooperative communication method according to claim 8, wherein

The cooperation mode includes an inter-cell cooperation mode and an intra-cell cooperation mode, where

When the serving base station determines that the user equipment enters the intra-cell cooperation mode, the serving base station performs joint resource scheduling on the remote radio equipment in the serving cell, and cooperatively transmits data to the User equipment,

When the serving base station determines that the user equipment enters an inter-cell cooperation mode, the The serving base station and the cooperative base station perform joint resource scheduling on the remote radio equipment in the serving cell and the coordinated cell, and cooperatively transmit data to the user equipment through the remote radio frequency device.

20. The cooperative communication method according to claim 19, wherein

Data to be cooperatively transmitted is shared by the serving base station and the cooperative base station, and simultaneously transmitted to the user equipment by the remote radio equipment; or

The data to be cooperatively transmitted is not shared by the serving base station and the cooperative base station, and is transmitted to the user equipment by only one or more remote radio equipments of one of the base stations at a timing.

21. The cooperative communication method according to claim 8, wherein

The joint resource scheduling includes uniformly allocating a unit frequency band of carrier aggregation, and

The serving base station and the cooperative base station respectively select a combination of unit frequency bands with the smallest interference of adjacent cells.

22. The cooperative communication method according to claim 21, wherein

The data to be cooperatively transmitted is shared by the serving base station and the cooperative base station, and simultaneously transmitted to the user equipment; or

The data to be cooperatively transmitted is not shared by the serving base station and the cooperative base station, and at a timing, data is transmitted to the user equipment only through at least one unit frequency band scheduled by one of the base stations.

23. The cooperative communication method according to claim 8, wherein

The joint resource scheduling includes: increasing the number of transmitting antennas for the user equipment entering the cooperative mode by the cooperative base station.

24. The cooperative communication method according to claim 23, wherein

The channel state characteristic information fed back by the user equipment in the non-cooperative mode does not include the channel state characteristic information of the coordinated cell; and the channel state characteristic information fed back by the user equipment in the cooperative mode includes the channel state characteristic information of the coordinated cell.

25. The cooperative communication method according to claim 24, wherein

The data to be cooperatively transmitted is not shared by the serving base station and the cooperative base station, and at a timing, data is transmitted to the user equipment only by at least one unit frequency band selected by one of the base stations.

26. The cooperative communication method according to claim 7, wherein In the case that the cooperation mode is the intra-cell cooperation mode, the user equipment separately sends data to be cooperatively transmitted to at least two remote radio frequency devices in the serving cell according to the scheduling information, and the serving base station pairs Data from the at least two remote radio devices is merged.

27. The cooperative communication method according to claim 7, wherein

In the case that the cooperation mode is the inter-cell cooperation mode, the user equipment separately transmits data to be cooperatively transmitted to the remote radio equipment in the serving cell and the coordinated cell according to the scheduling information, and the serving base station is in the Performing a merge operation after performing data exchange with the cooperative base station.

28. A base station for implementing cooperative communication, comprising:

a transceiver unit that receives and transmits data and signaling;

a communication environment information receiving and measuring unit, configured to obtain communication environment information according to data received by the transceiver unit, where the communication environment information includes at least channel state characteristic information reflecting channel state characteristics and neighbor cell interference information;

An exchange unit, exchanging the communication environment information with a neighboring base station;

a resource scheduling unit, according to the exchanged communication environment information, performing joint resource scheduling on a user equipment entering a cooperative mode, where

The transceiver unit performs cooperative data transmission with the neighboring base station according to the scheduling information after the joint resource scheduling.

29. The base station of claim 28, further comprising:

The cooperation mode judging unit judges whether the user equipment enters the cooperation mode based on the measured communication environment information.

30. The base station according to claim 28, wherein

The resource scheduling unit performs joint resource scheduling on the downlink resources, and the switching unit further exchanges data to be cooperatively transmitted with the neighboring base station.

The base station according to claim 30, further comprising:

The power allocation and optimization unit performs power allocation on the data to be cooperatively transmitted and performs transmitter optimization processing.

32. The base station according to claim 28, wherein

The resource scheduling unit performs joint resource scheduling on the uplink resource,

Transceiver unit sends the scheduling information to the user equipment, and After the user equipment sends data to the base station and the neighboring base station according to the scheduling information, the base station and the neighboring base station perform data exchange of data sent by the user equipment.

33. The base station of claim 32, further comprising

The data processing unit performs a merge process on the data sent by the exchanged user equipment.

34. A user equipment for implementing cooperative communication, comprising:

a transceiver unit that receives and transmits data and signaling;

a data processing unit that processes the received data;

The collaboration information acquisition unit acquires collaboration information from the processed data, where the collaboration information includes scheduling information after the resource base station and the coordinated base station jointly perform resource scheduling.

The data processing unit further acquires information related to communication environment information, and feeds back to at least one of the serving base station and the cooperative base station via the transceiver unit, where the communication environment information includes at least channel state characteristics reflecting channel state characteristics. Information and neighbor cell interference information.

The user equipment according to claim 34, further comprising:

a transmitter optimization unit, where the cooperation information further includes information that the serving base station indicates that the user equipment enters an uplink cooperation mode, performs optimization processing according to the cooperation information, and sends the service base station to the serving base station and the At least one of the cooperative base stations transmits data.

36. The user equipment according to claim 34, wherein

In a case where the cooperation information further includes information indicating that the user equipment enters a downlink cooperation mode, the data processing unit performs a combining process on data from the serving base station and the cooperative base station.

37. A communication system for implementing cooperative communication, the communication system comprising a serving base station, a cooperative base station, and a user equipment, wherein:

The serving base station includes:

Transceiver unit, receiving data and signaling,

a communication environment information receiving and measuring unit, configured to obtain communication environment information according to data received by the transceiver unit, where the communication environment information includes at least channel state characteristic information reflecting channel state characteristics and neighbor cell interference information,

An exchange unit that exchanges the communication environment information with the cooperative base station, and a resource scheduling unit, configured to perform joint resource scheduling on a user equipment entering a cooperative mode according to the exchanged communication environment information, where

The transceiver unit performs cooperative data transmission with the cooperative base station according to the scheduling information after the joint resource scheduling;

The user equipment includes:

Transceiver unit, receiving data and signaling,

a data processing unit that processes the received data, and

The data processing unit further acquires information related to communication environment information, and feeds back to at least one of the serving base station and the cooperative base station by the transceiver unit.

38. A communication system for implementing cooperative communication, the communication system comprising a child node and a central service node and a central collaboration node, wherein:

For the child node of the cell in which the central service node is located in the cooperation mode, the central service node and the at least one central cooperation node exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, the communication environment information Include at least channel state characteristic information reflecting channel state characteristics and neighbor cell interference information;

39. A program for cooperative communication, such that a serving base station and a computer at at least one coordinated base station side perform steps:

For the user equipment entering the cooperative mode in the serving cell, the serving base station and the at least one cooperative base station exchange communication environment information, and perform joint resource scheduling according to the exchanged communication environment information, where the communication environment information includes at least channel state characteristics reflecting channel state characteristics. Information and neighbor cell interference information;

40. A program for cooperative communication, such that a computer on a user equipment side performs the steps of: receiving and transmitting data and signaling; Processing the received data;

And acquiring information related to the communication environment information, and feeding back to at least one of the serving base station and the cooperative base station, where the communication environment information includes at least channel state characteristic information that reflects channel state characteristics and neighbor cell interference information.

41. A storage medium having the program of claim 39 incorporated.

42. A storage medium incorporating the program of claim 40.